Question 436495
I think you may have typoed and put 55400 instead of 55440 (simply because 55400/462 is not an integer, as you will see).


For this problem, we can note that {{{nPr/nCr = ( n!/(n-r)! )/( n!/(n-r)!r! ) = r! = 55440/462 = 120}}}. Since r! = 120, r = 5.