Question 388973
11!

The factorial (!) of a positive integer n is the product of all positive integers less than or equal to n.
11*10*9*8*7*6*5*4*3*2*1

Multiply 11 by 10 to get 110.
110*9*8*7*6*5*4*3*2*1

Multiply 110 by 9 to get 990.
990*8*7*6*5*4*3*2*1

Multiply 990 by 8 to get 7920.
7920*7*6*5*4*3*2*1

Multiply 7920 by 7 to get 55440.
55440*6*5*4*3*2*1

Multiply 55440 by 6 to get 332640.
332640*5*4*3*2*1

Multiply 332640 by 5 to get 1663200.
1663200*4*3*2*1

Multiply 1663200 by 4 to get 6652800.
6652800*3*2*1

Multiply 6652800 by 3 to get 19958400.
19958400*2*1

Multiply 19958400 by 2 to get 39916800.
39916800*1

Multiply 39916800 by 1 to get 39916800.
39916800