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Math Help - Contest problem 4

  1. #1
    Junior Member Kanwar245's Avatar
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    Contest problem 4

    What is the last digit of the sum of 1! + 2! + 3! + 4! + ... + 9! ?
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  2. #2
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    Re: Contest problem 4

    Hint: if N>4 then the last digit of N! is 0.
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