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From 8 red and 7 white flowers, in how many ways can 2 red and 2 white flowers be selected?

Answer and explanation

Correct answer: 588

The governing concept is combination because only selection matters; the order in which flowers are chosen does not matter. First select 2 red flowers from 8: C(8,2) = 8×7/(2×1) = 28. Independently, select 2 white flowers from 7: C(7,2) = 7×6/(2×1) = 21. Since both conditions must occur together, apply the multiplication principle: C(8,2)×C(7,2) = 28×21 = 588. Therefore, option B is correct. Option A does not use the full product correctly, option C overcounts the selections, and option D is much too small. Flowers of the same colour are not ordered, so permutations are unnecessary.

Related tags

CombinationsIndependent-SelectionPermutations-And-CombinationsPermutations And CombinationsMathematicsClass 11 Mcq

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