Assign 5

Exercise 1 page 88

1. Four people are to be arranged in a row to have their picture taken. In how many ways can this be done?

Solution

Four can be arrange of the folowing order

\(P(n,n) = \frac {n!}{(n- k)!}\) \(P(4,4) = \frac {4!}{4-4}!\) \(P(4,4) = \frac {4*3*2*1}{0}!\) \(P(4,4) = 24\)

There are 24 ways to arange 4 people.