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A six-letter code uses only the letters A, B, C, D, and E. The first and sixth letters must be the same, and the second and fifth letters must be the same. Repetition is allowed. How many codes are possible?

Answer and explanation

Correct answer: 625 codes

Choose the first, second, third, and fourth letters freely, with 5 choices for each. The sixth letter is then fixed by the first, and the fifth by the second. Therefore, there are 5⁴ = 625 codes.

Related tags

Fundamental Counting PrincipleRepeated-Position ConstraintsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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