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Part ACSIR NET December 2025conditioning-divides-by-the-given-event-not-the-other-one

Conditioning divides by the given event not the other one

In a class, 40% and 20% students passed in Mathematics and Physics, respectively, and 10% students passed in both subjects. What is the probability of a randomly selected student to have passed in Physics if the student already passed in Mathematics?

  1. A.1/2
  2. B.1/20
  3. C.1/4✓
  4. D.2/25

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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