Question 45710
22C4=22!/(4!*18!)=22*21*20*19/(4*3*2*1*)=7315..OK
my answer is 7315
P(6,5)=6!/(6-5)!=6!=720

 my answer is 720 this one I'm not sure about. These two problems deal with Combination (subset) and Permutations Thanks for checking my answers.