Question

What is the value of 1*1! + 2*2! + 3!*3! + ............ n*n! ?

Answer 1

It's massive.

Answer 2

that is \[\sum_{1}^{n} a!*a!\] right? im not sure if there is a simplification

Answer 3

no u r wrong

Answer 4

how could be this possible?

Answer 5

Should they all be n!*n!, or is the 3!*3! a typo?

Answer 6

If it's a typo, I guess it would be:
\[\sum_1^n n^2(n-1)!\]

Answer 7

it is 3*3! not 3!*3!