Problema Solution
There are 9 blue marbles, 2 red marbles, and 1 green marble in a bag. If a marble is randomly chosen, what is the probability that it is not blue?
Answer provided by our tutors
total marbles: 9+2+1 = 12
total not blue marbles: 2+1 = 3
so the probability it is not blue is 3/12, which is 1/4, which is .25