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An identity number has (2) distinct letters followed by (4) odd digits. Letters cannot repeat and odd digits may repeat. How many identity numbers can be formed?

Answer and explanation

Correct answer: (406250)

For letters there are (26\times25) choices and for odd digits (5^4) choices. If repetition is allowed, each place keeps the same choices.

Related tags

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

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