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Non - Zero Digit (Posted on 2003-12-21) Difficulty: 4 of 5
What is the last non - zero digit in (20!)!? (That is, factorial of 20 factorial).

See The Solution Submitted by Ravi Raja    
Rating: 2.6667 (6 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): simple solution | Comment 7 of 11 |
(In reply to re: simple solution by Charlie)

By the way, with the only possibilities being 2, 4, 6 and 8, it's not too hard to get the right answer by an invalid method.
  Posted by Charlie on 2003-12-22 08:46:01

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