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What is the value of 1*1! + 2*2! + 3!*3! + ............ n*n! ? | |
A. | n(n-1)(n-1)! [Wrong Answer] |
B. | (n+1)!/(n(n-1)) [Wrong Answer] |
C. | (n+1)! - n! [Wrong Answer] |
D. | (n + 1)! - 1! [Correct Answer] |