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Sum of series

by cgchayan
Tags: series
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cgchayan
#1
Sep11-10, 09:44 AM
P: 4
what will be the sum of this series?
[tex]\Sigma[/tex] nCr . 2r
where r = 0 to n
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l'H˘pital
#2
Sep11-10, 12:56 PM
P: 258
Hint:
[tex]
\sum_{r=0}^n _nC_r \cdot 2^r = \sum_{r=0}^n _nC_r \cdot 2^r \cdot 1^{n-r}
[/tex]
cgchayan
#3
Sep11-10, 03:23 PM
P: 4
thanx

Sherard
#4
Sep15-10, 02:22 AM
P: 3
Sum of series

thanks for sharing information....


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