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