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A box contains 24 marbles, some are green and other are blue. If a marble is drawn at random from the box, the porbability that it is green is 2/3. The number of blue balls in the box is

13
12
16
8

Correct Answer: 8

Explanation:

Let the number of green marble = x
Then, Probability of getting a green marble
= ^xc₁ / ²⁴c₁ = 2/3
⇒ x/24 = 2/3
⇒ x = 16

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