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A 4-letter code has vowels in its first two places and consonants in its last two places. There are 3 available vowels and 5 available consonants, and no letter may be repeated. How many codes are possible?

Answer and explanation

Correct answer: 120 codes

The two vowel places can be filled in 3 × 2 ways, since a vowel cannot be reused. The consonant places can be filled in 5 × 4 ways. Therefore, the total is 3 × 2 × 5 × 4 = 120 codes.

Related tags

Fundamental Principle Of CountingClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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