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If (1 + x)^(n) = C(0) + C(1) x + C(2) x...

If ` (1 + x)^(n) = C_(0) + C_(1) x + C_(2) x^(2) +…+ C_(n) x^(n)` , find the values of the following .
`sum_(i=0)^(n) sum_(j=0)^(n) (C_(i) + C_(j))`

A

`2^(2n)`

B

`2^(n)`

C

`2n`

D

None of these

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The correct Answer is:
D
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