Discussion of Question with ID = 022 under Probability

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A bag contains three marbles 4 Red, 5 Green and 3 Blue. One marble is taken out. What is the probability of drawing a red marble.

1/3.

5/12.

1/4.

4/9.

Soln.
Ans: a

Total ways of drawing a marble = 4 + 5 + 3 = 12. Of these red marble can be drawn in 4 ways. So required probability = 4/12 = 1/3.