Evaluate C(13, 6).

3 answers

C(13, 6)
= 13!/(6!7!)
= 1716
13!/(7! 6!) =

13*12*11*10*9*8/(6*5*4*3*2) =

13*11*(12/6)*(10/5)*(9/3)*(8/(4*2)) =

13*11*2*2*3 =

(12^2 - 1)*2*2*3=

143*2*2*3=

429*4=

(430-1)*4=

1716
most calculators have that function build in.
look for a key that looks something like
nCr