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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)

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re: Seems Simple | Comment 9 of 11 |
(In reply to Seems Simple by don scheuer)

That's the last non-zero digit of 20! itself, but not of the factorial of that number.
  Posted by Charlie on 2003-12-22 14:25:13

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