Question

What is the formula to find the value of 1*1!+2*2!+3*3!+...................................+10*10!

Answer 1

The formula for 1*1!+2*2!+.......+n*n!=(n+1)!-1
=>1*1!+2*2!+....+10*10!=(10+1)!-1
                                     =11!-1
                                     =39916800

Answer 2

this does not have any formula just refer ur maths book its from permutation chapter.