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A 4-place code uses the digits 0, 1, 2, 3, 4, 5, and 6. The first place cannot be 0, and repetition is allowed. How many codes are possible?

Answer and explanation

Correct answer: 2,058 codes

There are 6 choices for the first place because 0 is not allowed there. Repetition is allowed, so each of the other three places has 7 choices. Therefore, 6 × 7 × 7 × 7 = 6 × 7³ = 2,058 codes.

Related tags

Permutations And CombinationsFundamental Principle Of CountingMathematicsClass 11 Mcq

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