SSC CGL • GENERAL INTELLIGENCE & REASONING • NOTE 18
Analogy
Notes for SSC CGL examinations — name the exact relationship, preserve its direction, and transfer the same rule from the first pair to the second.
1The Big Picture — Graphic Mind Map
Semantic
meaning • function • class • cause
Number
operation • digits • powers • sequence
Letter
position • shift • opposite • pattern
Alphanumeric
letters + numbers • dual rule
Figural
rotate • reflect • add • shade • count
Direction
first → second, never vague association
Similarity
same relation, not same appearance
Verification
state rule • apply rule • reject extras
Analogy is not “these things are connected.” It is: “the same precise, directional rule changes the first item into the second item in both pairs.”
2The Foundation — Basics to Complete Relationship Mastery
2.1 Structure and Direction
\(A:B::C:D\)
Read: “\(A\) is related to \(B\) in the same way that \(C\) is related to \(D\).” First define the rule as a verb phrase from left to right.
Calf→Cow
Correct rule: “young one of → adult animal.” Reverse rule “adult of” is different. Therefore foal → horse matches; horse → foal does not.
2.2 The Five-Step Solver
Classify: word, number, letter or figure
State the narrowest rule for first pair
Preserve direction and order
Apply once to the new first term
Verify every feature; reject extras
If several rules fit the first pair, prefer the simplest standard rule that produces exactly one option. Options are evidence, but never permission to invent a strained rule.
2.3 Semantic Relationship Atlas
Relationship
Direction phrase
Model pair
What must remain same
Synonym
means nearly the same as
Rapid : Swift
part of speech and sense
Antonym
opposite in meaning to
Expand : Contract
same semantic dimension
Worker–tool
normally works with
Carpenter : Saw
profession first, instrument second
Worker–workplace
normally works in
Chef : Kitchen
person first, place second
Object–function
is used to
Thermometer : Measure temperature
object first, primary function second
Part–whole
is a component of
Page : Book
smaller unit first
Whole–part
contains
Tree : Branch
reverse of part–whole
Class–member
has member/example
Metal : Copper
general class first
Member–class
belongs to class
Rose : Flower
specific first
Product–raw material
is made from
Paper : Pulp
finished item first
Cause–effect
may produce
Virus : Disease
cause precedes effect
Instrument–measurement
measures
Barometer : Pressure
instrument first, quantity second
Young one–adult
develops into
Larva : Insect
life stage direction
Place–product
is where this is produced/stored
Mint : Coin
precise institutional role
Degree/intensity
is a stronger/weaker degree of
Warm : Hot
same quality, changed intensity
2.4 Synonym vs Associated Word
A synonym can substitute in a matching context. Mere association is weaker.
Silent≈Quiet
“Silence : Library” is object/typical place, not synonymy. Match the type of relation, not a loose topic connection.
2.5 Antonym Precision
True antonyms oppose on the same dimension and usually share grammatical form.
Victory↔Defeat
“Victory : Enemy” is associated, not opposite. “Accept : Rejection” mixes verb and noun; prefer matching form when options allow.
2.6 Class–Member vs Part–Whole
A member is a complete example of a class; a part is a physical/structural component of a whole.
Use the test: “Is the first item itself a kind of the second, or merely inside it?”
2.7 Function, Tool, User and Workplace
These four frequently overlap, so encode direction explicitly:
Surgeonuses →Scalpel
Scalpelfunction →Cut
Surgeonworks in →Hospital
The pair “Surgeon : Scalpel” must match another professional → specialised tool, not tool → function.
2.8 Cause, Effect, Source and Product
Ask what process links the nouns:
Cause → effect: friction → heat.
Source → product: bee → honey.
Raw material → product: clay → pottery.
Product → raw material: cloth → fibre.
Reversing source/product is a standard distractor.
2.9 Number Analogy — Rule Hierarchy
Test simple, standard rules before complicated ones. A useful hierarchy:
single operation \(+,-,\times,\div\)
square, cube or root
two-step form \(ax+b\)
digit sum/product/reversal
factor, prime or positional pattern
A valid rule must reproduce the first result exactly and transfer unchanged to the second input.
2.10 Direct Arithmetic Rules
\(a:b::c:d\quad\text{with}\quad b=R(a),\ d=R(c)\)
Common forms: \(R(x)=x+k\), \(kx\), \(x^2\), \(x^3\), \(x(x+1)\), or \(x^2\pm k\).
Example: \(6:42::8:?\) can use \(x(x+1)\), giving \(8\times9=72\).
2.11 Digit-Based Rules
For \(n=10a+b\), common transforms are:
\(S=a+b,\quad P=ab,\quad R=10b+a,\quad |a-b|\)
Example: \(34:12\) may be digit product \(3\times4\), so \(52:?\Rightarrow10\).
Do not switch from digit product in one pair to digit sum in another.
2.12 Symmetric and Reverse Rules
Some analogies reverse digits, swap positions, or use distance from a fixed number.
\(47:74::26:62\)
Check whether leading zero is allowed: reversal of \(40\) is usually \(4\), not \(04\), unless a fixed-width code is specified.
2.13 Letter Position System
\(A=1,B=2,\ldots,Z=26\)
\(\text{opposite-letter positions sum to }27\)
Thus \(A\leftrightarrow Z\), \(B\leftrightarrow Y\), \(C\leftrightarrow X\). A shift of \(+k\) moves forward; \(-k\) moves backward. Wrap cyclically only if the pattern requires it.
Landmark
A
E
J
M
N
T
Z
Position
\(1\)
\(5\)
\(10\)
\(13\)
\(14\)
\(20\)
\(26\)
2.14 Letter and Word Transformations
Track each position independently. Common rules:
all letters shift equally: CAT → FDW is \(+3,+3,+3\);
alternating shifts: \(+1,-1,+1,-1\);
reverse order; then shift;
replace each letter by its opposite;
move first/last letters or rotate positions.
Write a small shift vector under the first pair and copy it exactly.
\(C(3)\to F(6):+3\)
2.15 Alphanumeric Dual Rules
Separate the letter and number components, then test whether each follows its own rule.
B4→E16
Possible clean rule: letter \(+3\), number squared. Apply both, in the same order, to the new term.
\(B\to E:+3,\qquad4\to16:x^2\)
2.16 Figural Rotation
Rotation preserves handedness and internal arrangement while every point moves around a centre. Record angle and direction: \(90^\circ\) clockwise, \(180^\circ\), etc.
A \(180^\circ\) rotation is not automatically a mirror reflection.
2.17 Reflection vs Rotation
A vertical mirror swaps left and right but keeps top/bottom; a horizontal mirror swaps top/bottom but keeps left/right. Reflection reverses handedness.
2.18 Figural Feature Ledger
For the first pair, record changes in a fixed order:
Feature
Questions to ask
Orientation
rotated by how much and which direction?
Position
did an element move corner-to-corner, inside-to-outside, clockwise?
Count
were sides, dots, lines or components added/deleted?
enlarged, reduced or swapped with another element?
Apply all changed features, not just the most visible one.
2.19 Similarities and Differences
Two figures/items may be similar by relation while differing in surface form. Analogy asks for structural similarity.
Ignore irrelevant colour or size if the first pair ignores it.
Preserve a feature if it remains constant in the first transformation.
Reject an option that adds an extra transformation absent from the model.
\(\text{same relation}\ne\text{same appearance}\)
2.20 Choosing the Pair with the Same Relationship
When the question supplies a model pair and asks for a matching option, use a two-column test:
Name relation category
Write directional sentence
Test option left → right
Check specificity/degree
Reject reversed or broader pair
Example logic: “Scissors : Cut” means instrument → primary action. “Needle : Stitch” matches. “Tailor : Needle” is user → tool; “Cloth : Shirt” is material → product.
3Short Tricks & Ninja Techniques
3.1 Convert the Pair into One Sentence
Replace “associated with” by a narrow arrow sentence:
\(A\xrightarrow{\text{exact verb}}B\)
“Author writes book” immediately rejects publisher–book, reader–book and book–author reversals.
3.2 Specific Before General
If “cobbler : awl” fits professional → specialised tool, do not dilute it to person → object. The narrower valid rule separates options.
3.3 Number Rule: Minimum Complexity
Try \(+,-,\times,\div\), powers and \(ax+b\) before digit gymnastics. Prefer the rule with fewer arbitrary constants.
\(7:51\Rightarrow7^2+2\) is cleaner than a multi-step digit story
3.4 Use Options to Break a Tie
When two clean rules fit the model pair, apply both to the new input. Usually only one output appears. Do not design a rule backwards from a favourite option.
3.5 Alphabet Anchors
Memorise \(E=5,J=10,M=13,N=14,T=20,Z=26\). Count short distances from anchors instead of reciting from \(A\).
\(A+Z=B+Y=\cdots=27\)
3.6 Shift Vector for Letter Groups
Write numeric differences once:
\(ABC\to CED\Rightarrow(+2,+3,+1)\)
Copy the vector position by position to the second group. Use modular wrap beyond \(Z\) only when the analogy shows cyclic behaviour.
3.7 Figural: Mark a Reference Point
Choose one asymmetric dot, notch or shaded corner. Track it first to identify rotation/reflection; then verify the remaining elements.
3.8 Count Change Before Shape Change
In complex figures, count sides, dots and internal lines first. A simple \(+1\) or \(-1\) count rule may be the true analogy while orientation is unchanged.
3.9 Fast Decision Board
word pair write a narrow directional verb
number pair test simplest exact operation first
letters convert to positions and copy shift vector
figure track orientation, position, count and shading
4The SSC / TCS Traps — Red Flags & Edge Cases
🚩 Trap 1: Correct Association, Wrong Relation
“Doctor : Hospital” and “Teacher : Book” are both associated, but the first is worker–workplace; the second is worker–resource.
🚩 Trap 2: Direction Reversed
“Puppy : Dog” is young → adult. “Cat : Kitten” reverses it and is therefore wrong despite using the correct animal family.
\(A\to B\ne B\to A\)
🚩 Trap 3: Part vs Member
A wheel is part of a car; a sedan is a member/type of cars. Both can be “inside the idea of car,” but structurally differ.
🚩 Trap 4: Overfitted Number Rule
One pair can support infinitely many formulas. Reject rules with arbitrary constants or special exceptions when a standard operation fits.
If \(34\to12\) uses digit product, \(52\) must also use digit product. Sum, product and reversal cannot be mixed just to reach an option.
\(3\times4=12\Rightarrow5\times2=10\)
🚩 Trap 6: Alphabet Wrap Assumed
A \(+3\) shift from \(Y\) gives \(B\) only if cyclic wrap is part of the demonstrated rule. Otherwise the item may use backward shift or another pattern.
\(Y(25)+3=28\equiv2\pmod{26}\Rightarrow B\)
🚩 Trap 7: Mirror Mistaken for Rotation
Track an asymmetric marker. Rotation preserves clockwise ordering; reflection reverses it.
🚩 Trap 8: One Feature Matched, Another Ignored
An option may rotate correctly but shade the wrong corner, or add the right dot while changing line style. All model changes must transfer.
🚩 Trap 9: Knowledge Fact Too Broad
“India : Asia” is country → continent. “Nile : Africa” is river → continent, not the same relation, even though both locate something geographically.
Exam-pressure rule: never select an option merely because both words/numbers/figures “look connected.” Write the rule in one directional line and check every changed feature before marking.
5Memory Hooks & Mnemonics — Visual Recall
5.1 “Same Arrow, New Pair”
Imagine copying the labelled arrow from \(A\to B\) and pasting it between \(C\) and the answer.
5.2 “NAME It Before You CLAIM It”
NAME the relationship category and arrow sentence before claiming an option. This blocks association-based guesses.
5.3 “Member IS; Part IS IN”
A rose is a flower (member/class). A petal is in a rose (part/whole).
5.4 “27 Makes Alphabet Mirrors”
Opposite letter positions sum to \(27\): \(1+26,2+25,\ldots,13+14\).
\(p_{opposite}=27-p\)
5.5 “Numbers Enter the Same Machine”
Both first terms enter one unchanged rule machine. If the machine’s gears change, the analogy is invalid.
5.6 “Red Dot Never Lies”
In figural analogy, follow one asymmetric marker. Its path reveals rotation or reflection before the busy design distracts you.
5.7 “R-C-P-S” Figural Scan
Scan in order: Rotation/reflection, Count, Position, Shading/style.
5.8 “Exact Beats Clever”
The winning rule is exact, transferable and economical—not the most imaginative explanation.