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A 3-letter code uses 7 available letters, with the first letter fixed as M. No letter may be repeated. How many codes are possible?

Answer and explanation

Correct answer: 30 codes

The first position is fixed as M. Of the 7 available letters, 6 remain for the second position and then 5 for the third. Thus, 6 × 5 = 30 codes are possible.

Related tags

Counting PrincipleRestricted CountingFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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