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Q.The sum ∑r=1nr⋅r!\sum_{r=1}^{n} r \cdot r! equals

a
(n+1)!−1(n+1)! - 1
b
n!(n+1)n! (n+1)
c
(n+1)!+1(n+1)! + 1
d
n⋅n!n \cdot n!

Correct Answer: Option A

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

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