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A (5)-letter signal must contain exactly (2) vowels and (3) consonants. Assume (5) vowels and (21) consonants, with no letter repeated. How many signals are possible?

Answer and explanation

Correct answer: (10 \times 5 \times 4 \times 21 \times 20 \times 19)

First choose the (2) vowel positions in (10) ways, then fill vowels and consonants in order. Separate position selection from letter filling.

Related tags

CountingVowelsPositionsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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