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In how many ways can (4) children from (6) children be made to stand in the front row?

Answer and explanation

Correct answer: 360

Since changing the positions of the children in the front row gives a different arrangement, order matters. Therefore, the number of arrangements is \({}^{6}P_{4}=6\times5\times4\times3=360\). Option 15 is \({}^{6}C_{4}\), which does not consider order. Exam tip: Phrases such as “stand in a row” usually indicate a permutation.

Related tags

PermutationsArrangementsOrder MattersClass 11Front RowPermutations And CombinationsMathematicsClass 11 Mcq

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