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Part ACSIR NET September 2022count-favourable-seats

Count favourable seats

If 90 people are to be seated randomly in 15 rows of 6 seats each, what is the probability that a person gets a seat at either end of a row?

  1. A.1/2
  2. B.1/4
  3. C.1/3✓
  4. D.1/15

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.

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50 are analysed free — try those first.

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