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A 5-letter code uses only A, B, C, and D. The first and last letters must be the same, and repetition is allowed. How many codes are possible?

Answer and explanation

Correct answer: 256 codes

There are 4 choices for the first letter, which fixes the last letter. Each of the 3 middle positions has 4 choices. Thus, the number of codes is 4 × 4³ = 256.

Related tags

Counting PrincipleCode FormationFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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