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Factorial Difference Digits (Posted on 2014-01-12) Difficulty: 3 of 5
Determine the last two non-zero digits of 36! - 24!

Extra Challenge: Solving this puzzle without a computer program.

See The Solution Submitted by K Sengupta    
Rating: 5.0000 (1 votes)

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Solution re: A thought | Comment 2 of 6 |
(In reply to A thought by Charlie)

Can't this problem be re-written as:

(24!)(36!/24! - 1)

36!/24! will have at least two terminal zeroes. So if we subtract 1, the last two digits of our answer will be 99.

  Posted by Jyqm on 2014-01-12 13:47:53
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