Question

A hockey bag contains 5 red jerseys, 6 blue jerseys and 7 white jerseys.

What is the probability that Jack picks a white then a blue jersey if he puts the first one back.

Answer 1

7/54

Explanation:

A hockey bag contains 5 red jerseys, 6 blue jerseys and 7 white jerseys.

Let the total number of jerseys =

5 red jerseys + 6 blue jerseys 7 white jerseys.

= 18

P(White) = 7/18

P(Blue) = 6/18

Hence, the probability that Jack picks a white then a blue jersey if he puts the first one back.

This is probability with replacement, hence:

7/18 × 6/18

= 7/18 × 1/3

= 7/54