Respuesta :
Lets start by reading the question.
Justin - 20%
Cam - 50%
Ben - ____
If you look at the question, it states that there is one winner. So, we need to start by looking at the fact that 50 + 20 equals 70. So, what probability is left over out of 100%? 30%
Ben has a 30% probability that he will win the board game.