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A mobile PIN has (4) digits. The first digit cannot be (0), the last digit must be even, and the two middle digits may be any digits. Repetition is allowed. How many PINs are possible?

Answer and explanation

Correct answer: (9 \times 10 \times 10 \times 5=4500)

The last even digit has (5) choices from (0,2,4,6,8). With repetition allowed the middle places still have (10) choices each.

Related tags

CountingPinDigitsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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