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A signal uses (3) flags arranged vertically. They are chosen from (6) distinct flags, and if the blue flag is chosen it cannot be at the top. How many signals can be formed?

Answer and explanation

Correct answer: (100)

Subtract arrangements with blue on top, (5 \times 4), from total (6 \times 5 \times 4). Subtracting forbidden cases is simpler.

Related tags

PermutationsCombinationsCountingHardFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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