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

Answer:

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

Step-by-step explanation:

we have to evaluate P(5,3)

P(a, b) can be calculated as

$_b^a\txterm{P}=\frac{a!}{(a-b)!}$

$_3^5\txterm{P}=\frac{5!}{(5-3)!}$

$=\frac{5\times 4\times 3\times 2!}{2!}=60$

Hence, the correct option is 60 i.e

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