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How many 4-digit numbers can be formed using the digits $1, 2, 3, 4, 5$ if repetition of digits is allowed?
- A.120
- B.625
- C.256
- D.512
Show correct answer & step-by-step solution
Correct answer: B — 625
Solution
Since each of the 4 positions can be filled by any of the 5 digits, the total number of ways is .
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