Question

A bag contains 3 red marbles, 5 yellow marbles, and 4 blue marbles. One marble is chosen at random. What is the probability that the chosen marble will not be red

A 3/4

B 1/3

C 1/4

D 1/12

Answer 1

Sample space 5+3+4=12
Probability that the ball will not be red 5+4=9
9/12 when broken down is = 3/4
so (A) is the answer