\(\sum _{k=0}^{20}{\left({}^{20}C_{k}\right)}^{2}\) is equal to. [JEE Main 2021, 27 Aug (Shift 1)]
Q1
\(\sum _{k=0}^{20}{\left({}^{20}C_{k}\right)}^{2}\) is equal to.
[JEE Main 2021, 27 Aug (Shift 1)]
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