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Part ACSIR NET December 2024knowing-the-positions-too-keeps-the-count-small

Knowing the positions too keeps the count small

An OTP is made of six digits using 0 to 9. If three digits and their positions are known, what is the probability (in percentage) of discovering the full pin within 100 trials?

  1. A.10%✓
  2. B.20%
  3. C.30%
  4. D.40%

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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