Question

How to solve for 40! / 10!30!

Answer 1

40! / 30!  = 40*39*38*37*36*35*34*33*32*31

dividing this by 10!   10*9*8*7*6*5*4*3*2*1

 =    4*13*19*37*17*11*4*31

=      847,660,528