Question

If "cx = 56 and "Px = 336, then n is equal to
(1) 7
(3) 6
(4) 10
(278​

Answer 1

Step-by-step explanation:

ncx × x! =npx

56*x!=336

x!=6

x=3

np3=336

n!/(n-3)!=336

n(n-1)(n-2)=6×7×8

n=8