Multiple choice general knowledge math & puzzles

how many zero's are at the end of 15!?

  1. 3

  2. 4

  3. 5

  4. 6
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A Correct answer
Explanation

The number of trailing zeros in n! equals the number of times 10 appears as a factor, which is limited by the number of 5s. For 15! we count multiples of 5: 5, 10, 15 gives three 5s, and 25 would contribute another but 25 > 15. Thus there are exactly 3 trailing zeros.

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