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Subjects
Class 11MathematicsPermutations and CombinationsFundamental principle of countingHard
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A signal is made by placing (3) flags one above another. The flags are chosen from (7) distinct flags without repetition. How many signals are possible?

Answer and explanation

Correct answer: (210)

The top, middle, and bottom positions have (7,6,5) choices respectively. When order matters, multiply as an arrangement.

Related tags

SignalsFlagsCountingFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq
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