What is the total number of 4-digit combinations that can...

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PS · Problem Solving

505-555

Combinations

What is the total number of 4-digit combinations that can be formed using the digits 3, 5, 7, and 9 with repetition allowed?

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A

4^4

B

4^4-4

C

4^4-4^2

D

4^4-4^3

E

4^3

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Explanation

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