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Subjects
Class 11MathematicsPermutations and CombinationsFundamental principle of countingHard
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A box has (5) white, (4) black, and (3) green balls. (4) balls are to be selected so that exactly (2) colours are present. How many selections are possible?

Answer and explanation

Correct answer: (295)

For each pair of colours, take all (4)-selections and subtract single-colour selections, then add the three pairs. Exactly (2) colours means at least one ball from each chosen colour.

Related tags

CombinationsColoursHardFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq
सुधार सुझाएँ / Earn

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