Reasoning Ability - Lesson 7

Follow the symbol , not the algebra.

Inequalities are not equations to solve. Each symbol is a one-way relation - build the safest chain and check whether a conclusion is truly forced.

Learning time
16 min · self-paced
Exam weight
4-5 questions / set
Sections
9 modules
A>B=CD
thereforeA > C
Topic map

Build the chain, follow the direction.

Every inequality question is the same move: decode the symbols, lay out one clean chain, and test each conclusion against it.

The mental modelInequalities are comparison-chain problems. Each symbol is a one-way relation; the answer comes from building the safest chain and checking whether a conclusion is definitely forced.
A>B=CD
Rule 01

Symbol direction

Read >, <, =, ≥, ≤ without ever reversing meaning.

Rule 02

Equality lock

= allows replacement; ≥ is weaker than >.

Rule 03

Chain formation

A > B > C gives A > C. A > B < C does not.

Rule 04

Definite conclusion

A conclusion follows only if forced in every case.

Rule 05

Either-or logic

Complementary pairs can be valid together.

Rule 06

Coded inequalities

Decode #, @, $, % into standard signs first.

Rule 07

No-relation traps

Spot when two terms have no valid bridge.

Rule 08

Data sufficiency

Decide if statements build a definite comparison.

Checkpoint 09

Mastery check

Mini test + cheat sheet to lock it in.

Foundation - 01

Six rules that decide every conclusion.

Master the direction of a symbol and the weight of an equality, and the rest is just chaining.

Interactive
Symbol direction

A > B means A is greater than B. Read it the same way every time; never flip it mid-solve.

Use it
A > B lets you say B < A - same fact, stated from the other side.
Watch out
Using A > B to prove B > A. The direction is fixed.
A>B
Try it yourself

Build the chain - see if the conclusion is forced.

Set each link, then watch the verdict for A vs D. Same-direction links carry through; mix a greater with a smaller and the bridge breaks.

Live sandbox
A ? B
B ? C
C ? D
A > D is forced because every link points the same way.
A>B=CD
A conclusion follows only when one continuous, same-direction path links the two terms.
Method - 02

Decode, chain, test - conclusion by conclusion.

Build the comparison structure once, then judge each conclusion independently against it.

STEP 1

Decode symbols

Convert any coded signs into standard >, <, =, ≥, ≤ before thinking about conclusions.

STEP 2

Lay the chain

Rewrite statements as one clean left-to-right chain. Mark equalities and weak signs separately.

STEP 3

Find the path

For each conclusion, search for a continuous valid path between the two terms.

STEP 4

Keep the weakest

On a mixed chain, carry the weakest safe relation. Accept only what is definitely true.

Pro tip. When no path connects two terms, immediately mark no definite relation - do not force a comparison the chain does not support.
Question types - 03

The 7 formats every exam recycles.

Recognize the format fast and you already know whether to decode, chain, or hunt for a broken bridge.

Direct inequality

What it looks like
Standard symbols, two or three conclusions to test.
How to solve
Chain the statements and test each conclusion for a valid same-direction path.
Mini example. A > B ≥ C → A > C follows.
Trap: Reversing a conclusion's direction.

Coded inequality

What it looks like
Relations hidden behind #, @, $, % symbols.
How to solve
Decode every symbol to a standard sign, then solve normally.
Mini example. If # means ≥, A # B # C → A ≥ C.
Trap: Solving before decoding.

Mixed equality chain

What it looks like
A blend of >, ≥, =, ≤ in one chain.
How to solve
Track equalities and weak signs carefully; keep the weakest safe result.
Mini example. A ≥ B = C → A ≥ C, but not A > C.
Trap: Treating ≥ as strict >.

Reverse-conclusion trap

What it looks like
A conclusion stated in the opposite direction.
How to solve
Rewrite the exact conclusion direction before judging it.
Mini example. A > B does not prove B > A.
Trap: Assuming symmetry.

No direct relation

What it looks like
Two terms appear but are not linked by a valid chain.
How to solve
If a valley breaks the path, mark no definite relation.
Mini example. A > B < C → A vs C unknown.
Trap: Bridging across a valley.

Either-or conclusions

What it looks like
Two complementary conclusions on the same pair.
How to solve
Check whether the pair is complementary and exhaustive.
Mini example. A ≥ B or A < B → either-or.
Trap: Using it for any two uncertain conclusions.

Data sufficiency

What it looks like
Decide if statements build a definite comparison.
How to solve
Test each statement alone for a complete chain, then combined.
Mini example. I: A>B. II: B>C. Together A>C.
Trap: Combining before testing each alone.
Worked examples - 04

Two chains solved, link by link.

Watch a clean chain and a broken chain resolve conclusion by conclusion.

Problem
QuestionStatements: A > B = C ≥ D. Conclusions: I. A > C II. C ≥ D III. A > D.
Answer
? ? ?
Build the chain
A>B=CD
Step 1. Lay out the full chain exactly as given.
1 / 4
Common traps - 05

The 5 traps that flip a right answer to wrong.

Tap any card to flip from the wrong instinct to the correction.

Trap 01 - Reading backward
A > B, so I can use B > A too.
Tap for the fix
Trap 02 - Ignoring equality
≥ is basically the same as >.
Tap for the fix
Trap 03 - Joining through a valley
A > B < C, so A and C are comparable.
Tap for the fix
Trap 04 - Real-world intuition
A must be bigger - it just feels right.
Tap for the fix
Trap 05 - Either-or misuse
Both conclusions are uncertain, so either-or.
Tap for the fix
Best practices - 06

Six habits for clean, fast chains.

Small disciplines that keep the direction honest under time pressure.

TIP 01
Decode before you think

Convert coded signs to standard symbols before touching the conclusions.

TIP 02
Draw comparison arrows

For longer chains, sketch left-to-right arrows so direction stays visible.

TIP 03
One conclusion at a time

Test each conclusion independently - do not carry bias from the first.

TIP 04
Respect the weak signs

Keep ≥ and ≤ in mind right up to the final verdict.

TIP 05
No path? No relation

When nothing connects two terms, mark no definite relation immediately.

TIP 06
Eliminate after clarity

In timed tests, use option elimination only once the chain is clear.

Mini practice - 07

Test it on 4 chains.

Mixed difficulty, no timer. Every answer comes with a worked explanation and a diagram.

Question 1 of 4Easy
Score - 0/4
Statements: A > B > C. Which definitely follows?
Streak target: 3 in a row.
Cheat sheet - 08

One card to revise inequalities.

The chain rules that decide every conclusion.

Chain rules
ChainDefinite conclusion
A > B > CA > C
A ≥ B > CA > C
A > B ≥ CA > C
A ≥ B ≥ CA ≥ C (not A > C)
A > B < Cno relation
Decode the weak signs
=two-way replacement
≥ / ≤weaker than > / <
either-oronly if complementary & exhaustive
The exam-time process
  • 01Decode coded symbols before anything else.
  • 02Lay one clean chain and mark equalities separately.
  • 03Test each conclusion for a valid same-direction path.
  • 04Keep the weakest safe relation on mixed chains.
  • 05No path between two terms means no definite relation.
  • 06Either-or only when the pair is complementary.
Build the chain, follow the direction, keep the weakest safe relation.
What's next - 09

Lesson done. Time to lock it in.

Practice the hard stuff, queue the next topic, or revisit what tripped you up.

Practice 20 inequality questions

Direct, coded, and either-or sets with instant explanations. ~15 minutes.

Start practice

Continue to next topic

Up next: Order & Ranking - another line-logic skill.

Continue

Revisit mistakes

Re-drill the broken-chain and either-or traps.

Open notebook

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