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A four-place code has letters in its first two places and digits in its last two places. If 5 letters and 6 digits are available and repetition is not allowed, how many codes are possible?

Answer and explanation

Correct answer: 600 codes

The two letter places can be filled in 5 × 4 ways, and the two digit places in 6 × 5 ways. By the fundamental principle of counting, the total is (5 × 4) × (6 × 5) = 600 codes.

Related tags

Counting PrinciplePermutationsClass 11Fundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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