List of top Mathematics Questions on Binomial theorem asked in IPU CET

The sum \[ \sum_{k=0}^5 \left( 5C_k \right)^2 \] is equal to

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The value of \({}^{40}C_0 + {}^{40}C_1 + {}^{40}C_2 + \ldots + {}^{40}C_{20}\) is