Question

calcule esta combinação C15,7

Answer 1

C (15 , 7) =

15.14.13.12.11.10.9/7!

32432400/5040

6435 ✓

Answer 2

Resposta:

C15,7 =15!/(15-7!)7! =15!/8!7!

=15*14*13*12*11*10*9*8!/8!7!

=15*14*13*12*11*10*9/7*6*5*4*3*2*1

=3*2*13*2*11*10*9/4*3*2*1

=3*13*11*10*9/3*2*1

=13*11*10*9/2*1

=13*11*5*9 = 6435