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A 4-digit number is formed with its first two digits chosen from 1, 2, 3, 4 and its last two digits chosen from 5, 6, 7, 8, 9. Repetition is not allowed within either pair. How many numbers are possible?

Answer and explanation

Correct answer: 240 numbers

The first two places can be filled in 4 × 3 ways, and the last two in 5 × 4 ways. The two digit sets do not overlap, so the total is 4 × 3 × 5 × 4 = 240 numbers.

Related tags

Counting PrinciplePermutationsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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