If { }^{20} \C_{r} is the coefficient of x^{r} in the expansion of (1+x)^{20}, then the value of \\sum^{20}_{r=0} r^{2}, { }^{20}\C_{r} is equal to [26 Aug 2021 Shift 1]

JEE Main 26-Aug-2021 Shift 1 Solved Paper

Section: Mathematics

Question : 69 of 90

Marks: +1, -0

If ‌20Cr is the coefficient of xr in the expansion of (1+x)20, then the value of

r=0

r2,‌20Cr is equal to

[26 Aug 2021 Shift 1]

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