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Q.The value of ∑r=0n(nr)2\sum_{r=0}^{n} \binom{n}{r}^2 is

a
(2nn)\binom{2n}{n}
b
(2nn+1)\binom{2n}{n+1}
c
2(2nn)2 \binom{2n}{n}
d
(nn/2)2\binom{n}{n/2}^2

Correct Answer: Option A

The correct solution involves applying the fundamental concept to derive the final value step by step...

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