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JEE Main Mathematics question

MathematicsPermutations and CombinationsJEE Main

A bag contains black, white and red balls, all the balls being different. The number of selections of at most balls containing balls of all the colours, is

Answer: (D)

Solution

Selections with at least one ball of each colour number . Remove those with more than balls: balls: ; balls (omit one ball): ; balls (omit two balls, not both red): ; these total

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Question ID VK-020678