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Quickie XI (Posted on 2017-11-27) Difficulty: 1 of 5
What is the last digit in S=sum(n=1 to 99) n!

See The Solution Submitted by Ady TZIDON    
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Solution Answer | Comment 1 of 2

the last digit in S=sum(n=1 to 99) n! = the last digit in S=sum(n=1 to 4) n!, because the last digit of (n=5 to 99) n! are all 0.

Therefore the answer is 3


  Posted by chun on 2017-11-27 08:55:24
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