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In the expansion of $(1+x)^{50}$, the sum of the coefficients of $\begin{array}{ll}\text { odd powers of } \mathrm{x} \text { is } & \end{array}$
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$2^{49}$
Sum of odd terms of expansion $(\mathrm{a}+\mathrm{b})^{\mathrm{n}}$ is $\frac{1}{2} \cdot 2^{\mathrm{n}}$.
$\therefore$ Sum of odd terms of expansion $(1+\mathrm{x})^{50}$ is $\frac{1}{2} \cdot 2^{50}$
$=2^{-1} .2^{50}=2^{49}$
$\therefore$ Sum of odd terms of expansion $(1+\mathrm{x})^{50}$ is $\frac{1}{2} \cdot 2^{50}$
$=2^{-1} .2^{50}=2^{49}$
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