Question

Evaluate: 5P5
A:120
B: 1
C: 132
D: 126
(This is permutations btw)

Answer 1

A. 120.

Explanation:

5P5 = 5! / (5-5)!

= 5! / 0!

= 5!/1

= 5!

= 120.

Answer 2

`_nP_k=(n!)/((n-k)!)\\\\\\_5P_5=(5!)/(0!)=120`