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A registration number has first (2) distinct letters followed by (4) digits. Letters are chosen from (6) available letters. In the digits, exactly one pair must be equal and the other two digits must be different from it and from each other. How many registration numbers are possible?

Answer and explanation

Correct answer: (129600)

The letters have (6 \times 5) ways. For digits, choose the positions of the equal pair, choose the repeated digit, and fill the other two positions with distinct digits in order.

Related tags

Registration-CodeRepetitionCountingFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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