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An exam roll number has (2) letters followed by (3) digits. The first letter must be a vowel, the second a consonant, and the (3) digits must not repeat. Assume (5) vowels in the English alphabet. How many roll numbers are possible?

Answer and explanation

Correct answer: (5 \times 21 \times 10 \times 9 \times 8)

The letter choices are (5) and (21), and the digit choices are (10,9,8). Keep letter restrictions separate from digit restrictions.

Related tags

CountingRoll-NumberVowelsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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