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Part ACSIR NET December 2025five-is-not-among-the-digits-so-the-units-digit-must-be-zero

Five is not among the digits so the units digit must be zero

How many 5-digit numbers can be formed from the digits 0, 2, 3, 4, 6, 7 and 9, using each at most once, which are divisible by 5?

  1. A.120
  2. B.240
  3. C.360✓
  4. D.720

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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