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GMAT Data Sufficiency (DS) | Re: If a marble is selected at random from a bag containing only red and

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Statement 1 is insufficient because we don't know how many red marbles are there in the bag.

Statement 2 is insufficient because we don't know the number of total marbles in the bag.

But if we combine both statements, we get total marble = 9, red marbles = 3.

Probability = 3/9 = 1/3

Option C is correct

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