Question

A bag contains 2 red marbles, 7 blue marbles and 5 green marbles. If two marbles are

drawn out of the bag, what is the exact probability that both marbles drawn will be
blue?

Answer 1

1/2

Explanation:

There are :-

⇒ 2 red marbles

⇒ 7 blue marbles

⇒ 5 green marbles

Probability (Blue)

• = No. of blue marbles / No. of total marbles
• = 7 / (2 + 7 + 5)
• = 7/14
• = 1/2