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A code consists of 2 distinct letters followed by 3 distinct digits. There are 7 letters and 5 digits available. How many codes are possible?

Answer and explanation

Correct answer: 2520 codes

The two letter positions can be filled in 7 × 6 ways, and the three digit positions in 5 × 4 × 3 ways because repetition is not allowed within either group. By the multiplication principle, the total is 7 × 6 × 5 × 4 × 3 = 2520 codes.

Related tags

Counting PrinciplePermutationsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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