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A 5-digit PIN uses the digits 0 through 8. Its first digit cannot be 0, and its last digit must be even. Repetition is allowed. How many PINs are possible?

Answer and explanation

Correct answer: 29160 PINs / 29160 PIN

The first position has 8 choices (1 through 8), each of the 3 middle positions has 9 choices, and the last position has 5 even choices (0, 2, 4, 6, 8). Since repetition is allowed, the total is 8 × 9³ × 5 = 29160 PINs.

Related tags

Counting PrincipleDigit RestrictionsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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