
#1
Sep1110, 09:44 AM

P: 4

what will be the sum of this series?
[tex]\Sigma[/tex] ^{n}C_{r} . 2^{r} where r = 0 to n 



#2
Sep1110, 12:56 PM

P: 256

Hint:
[tex] \sum_{r=0}^n _nC_r \cdot 2^r = \sum_{r=0}^n _nC_r \cdot 2^r \cdot 1^{nr} [/tex] 



#3
Sep1110, 03:23 PM

P: 4

thanx




#4
Sep1510, 02:22 AM

P: 3

sum of series
thanks for sharing information....



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