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A 4-digit PIN uses the digits 0, 1, 2, 3, 4, and 5. The first digit cannot be 0, and repetition is allowed. How many PINs are possible?

Answer and explanation

Correct answer: 1080 PINs / 1080 PIN

The first position has 5 choices because 0 is not allowed there. Each of the other 3 positions has 6 choices, since repetition is allowed. Thus, 5 × 6³ = 1080 PINs are possible.

Related tags

Counting PrinciplePin CodesClass 11Fundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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