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An app ID has (2) letters followed by (3) digits. Letters and digits may repeat, but the last digit must be even and the two letters must not be identical. How many IDs are possible?

Answer and explanation

Correct answer: (325000)

The letters have (26 \times 25) choices. For the three digits, the last has (5) choices and the other two have (10,10) choices.

Related tags

PermutationsCombinationsCountingHardFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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