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A (5)-letter signal uses only (A,B,C,D,E,F). The first and last letters must be different, but the middle (3) letters may repeat. How many signals are possible?

Answer and explanation

Correct answer: (6 \times 5 \times 6^3=6480)

The first letter has (6) choices and the last has (5), while each middle place has (6) choices. Reduce choices only where the condition applies.

Related tags

CountingSignalsLettersFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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