Question

A bag contains 8 red marbles, 4 blue marbles, and 5 white marbles. Tom picks two marbles at random, without replacement.

What is the probability that Tom picks two blue marbles?





What is the probability that Tom picks a red and a blue marble?




What is the probability that Tom picks two red marbles?

Answer 1

P(B,B) = 3/68

P(R,B) = 2/17

P(R,R) = 7/17

Explanation:

P(B,B) = 4/17 · 3/16 = 3/68

P(R,B) = 8/17 · 4/16 = 2/17

P(R,R) = 8/17 · 7/16 = 7/17