Question

Evaluate . 7C6

Answer 1

Main formula nCp= n!/ p!(n-p)!
so 7C6 = 7!/ 6!(1!)=5,040/720=7
the answer is D. 7 

Answer 2

This question involves mathematical combinations. The formula is:
nCr = n!/r!(n - r)!
Substituting the values:
7C6 = 7!/6!(7 - 6)!
= (7 x 6 x 5 x 4 x 3 x 2 x 1)/(6 x 5 x 4 x 3 x 2 x 1)(1)
= 7
The answer is D