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Rule Detection — Questions and Answers

Rule Detection gives a group of figures and asks which rule every one of them obeys. The correct rule must hold without exception, so a single figure that breaks it disqualifies the rule entirely. Test each candidate rule against every figure rather than confirming it on the first two and moving on.

8 solved questionsNon Verbal ReasoningFree · no signup

Rule Detection— Concepts, Formulas & Shortcuts

  • The rule must hold for EVERY figure, with no exceptions.
  • One counter-example is enough to eliminate a candidate rule.
  • Common rules: all figures are closed, all have an even number of sides, all contain a curve.
  • Beware of rules true of most figures but not all — the standard distractor.
  • Test the most restrictive rule first; it is fastest to falsify.
  • A rule about a property no figure has is vacuous, not correct.

Rule Detection Practice Questions with Answers

Attempt each question first, then open the explanation. All 8 questions below are free to read and require no signup.

  1. Q1.In rule detection, a valid rule must hold for:

    Easy
    • AMost figures
    • BEvery figure in the set
    • CThe first figure only
    • DHalf the figures
    +Show Answer & Explanation

    Answer: B. Every figure in the set

    Explanation: The rule is meant to characterise the whole group, so a single exception invalidates it.

    Rule Detection question 1 of 8

  2. Q2.A single figure that violates a candidate rule means the rule is:

    Easy
    • AStill valid
    • BInvalid
    • CPartially valid
    • DValid for the rest
    +Show Answer & Explanation

    Answer: B. Invalid

    Explanation: Universal rules admit no exceptions.

    Rule Detection question 2 of 8

  3. Q3.Which rule would be satisfied by a triangle, a square and a pentagon?

    Easy
    • AAll contain a curve
    • BAll are closed rectilinear figures
    • CAll have four sides
    • DAll are shaded
    +Show Answer & Explanation

    Answer: B. All are closed rectilinear figures

    Explanation: All three are closed shapes made entirely of straight lines.

    Rule Detection question 3 of 8

  4. Q4.Which rule fits a circle, an ellipse and a semicircle?

    Easy
    • AAll are polygons
    • BAll contain at least one curve
    • CAll have vertices
    • DAll have equal sides
    +Show Answer & Explanation

    Answer: B. All contain at least one curve

    Explanation: Each figure includes a curved boundary, and none is a polygon.

    Rule Detection question 4 of 8

  5. Q5.A rule that is true of three out of four figures is:

    Moderate
    • AThe correct rule
    • BNot the correct rule
    • CCorrect if the fourth is small
    • DCorrect by majority
    +Show Answer & Explanation

    Answer: B. Not the correct rule

    Explanation: Rule detection requires universality, not a majority.

    Rule Detection question 5 of 8

  6. Q6.Which rule fits a square, a rectangle and a rhombus?

    Moderate
    • AAll have four sides
    • BAll have equal sides
    • CAll have right angles
    • DAll contain curves
    +Show Answer & Explanation

    Answer: A. All have four sides

    Explanation: All three are quadrilaterals, though they differ in side lengths and angles.

    Rule Detection question 6 of 8

  7. Q7.Testing the most restrictive rule first is efficient because it:

    Moderate
    • AIs always correct
    • BIs fastest to falsify
    • CTakes longest
    • DApplies to one figure
    +Show Answer & Explanation

    Answer: B. Is fastest to falsify

    Explanation: A narrow rule is broken by more figures, so it is disproved quickly if wrong.

    Rule Detection question 7 of 8

  8. Q8.A rule describing a property that NO figure in the set has is:

    Moderate
    • ACorrect
    • BIncorrect
    • CVacuously true
    • DThe best answer
    +Show Answer & Explanation

    Answer: B. Incorrect

    Explanation: The rule is supposed to describe the set, so a property none of them has cannot be the answer.

    Rule Detection question 8 of 8

Rule Detection — Frequently Asked Questions

How is rule detection different from classification?+

Classification asks which figure breaks the pattern; rule detection asks which stated rule the whole set satisfies. One looks for the outlier, the other for the shared property.

What is the fastest way to eliminate a rule?+

Look for a single figure that violates it. Because the rule must be universal, one counter-example settles the matter immediately.

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