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A username has (2) distinct lowercase letters followed by (3) digits. Both letters cannot be vowels, and the (3) digits must be in increasing order. How many usernames are possible?

Answer and explanation

Correct answer: (75600)

Letters are possible in (26\times25-5\times4=630) ways and digits in (\binom{10}{3}=120) ways. In increasing order, the arrangement is automatically fixed.

Related tags

Permutations-And-CombinationsFundamental-PrincipleCountingHardFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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