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A signal has 4 places, with 3 colors available at each place. The colors in the first and third places must be the same, and repetition is allowed. How many signals are possible?

Answer and explanation

Correct answer: 27 signals

Choose the color for the first place in 3 ways; this fixes the color in the third place. The second and fourth places each have 3 choices. Thus, there are 3 × 3 × 3 = 27 signals.

Related tags

Counting PrinciplePermutations And CombinationsClass 11Fundamental Principle Of CountingMathematicsClass 11 Mcq

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