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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: sequences....
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[Post New]2 Jul 2007 21:58:16 IST
    Subject: sequences....
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shub (38)

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if t=k(k!),then summation 1to n of t is equal to ??
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[Post New]3 Jul 2007 07:58:33 IST
    Subject: Re:sequences....
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lazycol (711)

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t = k*k! = (k+1 - 1)*k! = (k+1)! - k!
sum = 2!-1! + 3!-2! + 4!-3! +........+(n+1)!-n!
       = (n-1)! - 1! =(n+1)! - 1
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