A bag contains 5 blue marbles, 6 red marbles, and 4 green marbles. You select one marble at random f

A bag contains 5 blue marbles, 6 red marbles, and 4 green marbles. You select one marble at random from the bag. What is P(blue)

P(blue) = Number of blue marbles / Total Marbles
P(blue) = 5 / (5 + 6 + 4)
P(blue) = 5/15

We can reduce this. So we type in 5/15 into our search engine, choose simplify, and we get:
P(blue) = 1/3