JEE MATHEMATICS MCQ: PERMUTATIONS

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There are three piles of identical yellow, black and green balls and each pile contains at least 20 balls. The number of ways of selecting 20 balls if the number of black balls to be selected is twice the number of yellow balls, is

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Correct option: B

Option B (7) is correct because it represents the number of possible values for the number of yellow balls that satisfy the given conditions.

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