What is the value of 1×1!+2×2!+3!×3!+............n×n!; where n! means n factorial or n(n−1)(n−2)...1

What is the value of 1×1!+2×2!+3!×3!+............n×n!;

where n! means n factorial or n(n−1)(n−2)...1

A.
n(n−1)(n−1)!
B.
C.
(n+1)! − n!
D.
(n+1)! − 1!

Correct Answer : D

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