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Sum of series

  1. Sep 11, 2010 #1
    what will be the sum of this series?
    [tex]\Sigma[/tex] nCr . 2r
    where r = 0 to n
     
  2. jcsd
  3. Sep 11, 2010 #2
    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]
     
  4. Sep 11, 2010 #3
    thanx
     
  5. Sep 15, 2010 #4
    thanks for sharing information....
     
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