Answers

2016-03-12T19:11:26+05:30
N=10 r=? 
npr= n!/(n-r)!
5040= 10!/(10-r)!
7! = 10!/(10-r)!
(10-r)!=  10!/7!
(10-r)!= 10*9*8*7!/7!
(10-r)!=10*9*8
(10-r)!=720
(10-r)!=6!
10-r=6 
r=10-6
r=4
1 5 1
hope i helped u
plz mark as brainliest
thank-you very much
most welcome