Question

Which of the following has the same value as C(10, 3)?

O P(10, 3)
O C(10,7)
O C(9,6)

Answer 1

Answer: C(10,7)

Reason:

We can numerically compute both C(10, 3) and C(10, 7) and we would get 120 for each result.

Use the nCr combination formula

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

In general we have the rule C(n, r) = C(n, n-r)