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Part ACSIR NET June 2024the-first-row-must-be-a-whole-number

The first row must be a whole number

A group of 540 persons is to be seated row wise such that the number of persons in each row is 4 less than in the previous row. Which of the following number of rows is not possible?

  1. A.5
  2. B.6
  3. C.8✓ Correct
  4. D.9

You have the answer. Trap Analysis is why the other three were written.

Not a worked solution repeated four times — the specific reasoning error each wrong option was built to reward, and why this one tests execution slip.

See pricing

50 are analysed free — try those first.

The trap it tests

Execution slip

The idea was right. The computation was not.

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