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    lemon14's Avatar
    lemon14 Posts: 143, Reputation: 9
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    #1

    Oct 6, 2013, 04:27 AM
    What is the formula for
    1*1! + 2*2! + 3*3! +... +n*n! And how do you get it?
    Celine91's Avatar
    Celine91 Posts: 51, Reputation: 9
    Junior Member
    		  
    #2

    Oct 6, 2013, 01:41 PM
    Not sure what you exactly mean ! But refer to this it may help..

    How to prove 1*1!+2*2!+3*3!...n*n!=(n+1)! -1 using mathematical induction? plz help? - Yahoo! Answers
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