Question

Evaluate C(8, 2). 56 28 40,320 20,160

Answer 1

Answer:

option B

28

Step-by-step explanation:

Given in the question,

C(8,2)

Formula to use

nCr = n! / r! * (n - r)!

here n = 8

        r  = 2

We have to calculate combinations of 8 object taken 2 at a time, then

C(8,2)  

8C2

8! / 2! * (8 - 2)!

$\frac{8*7*6*5*4*3*2*1}{2*1(6!)}$

$\frac{8*7*6*5*4*3*2*1}{2*1(6*5*4*3*2*1)}$

$\frac{8*7}2$

56/2

28

So, 8C2 = 28