Question

Evaluate P (5,3)
A.15
B.20
C.60

Answer 1

Am i supposed to multiply? 5 times 3 equals 15 

Answer 2

`_3^5\txterm{P}=60`

Explanation:

we have to evaluate P(5,3)

P(a, b) can be calculated as

`_b^a\txterm{P}=(a!)/((a-b)!)`

`_3^5\txterm{P}=(5!)/((5-3)!)`

`=(5* 4* 3* 2!)/(2!)=60`

Hence, the correct option is 60 i.e

`_3^5\txterm{P}=60`