The coefficient of \( x^{5} \) in the expansion of \( (1+x)^{21}+(1...

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The coefficient of \( x^{5} \) in the expansion of \( (1+x)^{21}+(1+x)^{22}+\ldots+(1+x)^{30} \) is:
\( \mathrm{P} \)
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