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In how many ways can 4 different coloured flags be placed in a straight line?

Answer and explanation

Correct answer: 24

The governing idea is a permutation, because the flags are different and their order in a straight line matters. For the first position there are 4 choices, for the second there are 3 remaining choices, then 2, and finally 1. By the multiplication principle, the total number of arrangements is 4×3×2×1=4!=24. Thus option D is correct. This is not a combination problem, because combinations ignore order. The values 8, 12, and 16 do not account for all successive choices and therefore undercount the possible linear arrangements. Every distinct order, such as ABCD and BACD, is counted separately.

Related tags

PermutationsFactorial NotationArrangementsPermutations And CombinationsMathematicsClass 11 Mcq

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