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

a
(n+mn)n!\binom{n+m}{n} n!
b
(n+mm)m!\binom{n+m}{m} m!
c
(n+mn)\binom{n+m}{n}
d
(n+m)!(n+m)!

Correct Answer: Option A

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

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