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[Post New]18 Dec 2006 19:40:15 IST
    Subject: Permutation and combination
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aki_ar2007 (0)

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Olaaa!! Perrrfect answer. 0  [0 rates]
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total posts: 2    
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Sir I wanna ask u a question
If an is the digit in the unit place of the no. 1!+2!+3!+...+n!, then
a8 + a9 + a10 +...+a16
 
a. 9        b. 18            c. 27          d. 57
    
 

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