Question

Evaluate 5C2 (nCR).

A.) 10
B.) 20
C.) 60

Answer 1

We may directly use our calculator to solve for the combination, 5C2 = 10. Another option is to use the equation for the combination that is,
nCr = n! / ((n - r)!r!))
Substituting the known values,
5C2 = 5! / ((5 - 2)!2!)) = 10
Thus, the answer is letter A.