The sum of coefficients of integral powers of $x$ in the binomial expansion of $(1 - 2 x)^{- n}$ is

\frac{1}{2} (3^{50} - 1)

\frac{1}{2} (2^{50} + 1)

\frac{1}{2} (3^{50} + 1)

\frac{1}{2} (3^{50})

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The sum of coefficients of integral powers of

x

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(1 - 2 x)^{- n}

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Question Text

The sum of coefficients of integral powers of

x

in the binomial expansion of

(1 - 2 x)^{- n}

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