Sum of series

  1. what will be the sum of this series?
    [tex]\Sigma[/tex] nCr . 2r
    where r = 0 to n
  2. jcsd
  3. Hint:
    \sum_{r=0}^n _nC_r \cdot 2^r = \sum_{r=0}^n _nC_r \cdot 2^r \cdot 1^{n-r}
  4. thanx
  5. thanks for sharing information....
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