Multiple choice general knowledge math & puzzles

trailing zeros of 123!

  1. 24

  2. 26

  3. 28

  4. 23

  5. 25
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

To find trailing zeros in $n!$, sum $\lfloor n/5^k \rfloor$. For $123!$: $\lfloor 123/5 \rfloor = 24$; $\lfloor 123/25 \rfloor = 4$. Total zeros = $24 + 4 = 28$. Options like 24 or 25 are incorrect because they miss the higher powers of 5 (like 25, 50, 75, 100).

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