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सिध्द कीजिए कि - 2C(0) + C(1) + 2C(2) ...

सिध्द कीजिए कि -
`2C_(0) + C_(1) + 2C_(2) + C_(3) + 2C_(4) + C_(5) +....+ = 3.2^(n-1)`

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