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Using the letters P, Q, R, S, and T without repetition, how many 3-letter codes can be formed if the first letter cannot be P?

Answer and explanation

Correct answer: 48 codes

The first place has 4 choices because P is excluded. Without repetition, the second place then has 4 choices and the third has 3. Thus, 4 × 4 × 3 = 48 codes can be formed.

Related tags

Permutations And CombinationsFundamental Principle Of CountingMathematicsClass 11 Mcq

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