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The sum of 1+n(1-1/x)+(n(n+1))/(2!)(1-1/...

The sum of `1+n(1-1/x)+(n(n+1))/(2!)(1-1/x)^2+.....oo`

A

`x^n`

B

`x^-n`

C

`(1-1/x)^n`

D

None of these

Text Solution

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The correct Answer is:
A
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PATHFINDER-BINOMIAL THEOREM-QUESTION BANK
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  5. If an=sum(r=0)^n1/(^nCr) , then sum(r=0)^nr/(^nCr) equals

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