Question

How many permutations exist of the letters p, q, r, s, and t, taking four at a time?
A: 120
B: 24
C: 5

Answer 1

5 distinct letters taken four at the time.

5*4*3*2= ?

or use the permutation formula: P(5,4)

Read more at this link:
http://www.mathsisfun.com/combinatorics/combinations-permutations.html

Answer 2

thank you so much!

Answer 3

You're welcome.