- r -1 nCrn isA- 2 nB- 2 n -1C- 2 n -1D- 2 n -1

The correct option is C 2^n 1∑r nbsp;= nbsp;0nCrn nbsp; nbsp;= nbsp;C0 nbsp; nbsp;n+ nbsp;C1 nbsp; nbsp;n nbsp;+C2 nbsp; nbsp;n nb ...

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General Term of Binomial Expansion

∑ r =1 nCrn i...

Question

$\sum_{r = 1}^{n} n C r$ is

2^{n}

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2^{n}

+ 1

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2^{n}

- 1

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2^{n - 1}

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Solution

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