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Non - Zero Digit II (Posted on 2012-02-05) Difficulty: 4 of 5
Reading from left to right, what is the last non - zero digit in ((20!)!)!? (That is, the factorial of factorial of 20 factorial).

No Solution Yet Submitted by K Sengupta    
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No Subject | Comment 6 of 7 |
See here

and here


  Posted by Benny on 2012-02-07 04:52:18
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