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How many 4-digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6, 7 if repetition of digits is allowed?

Would that be 840

3 answers

7 choices for each position, so

7x7x7x7 = 2401

oh ok... thanks

Haw many 4 digit numbers can formed from the digit 1,2,3,4,5,6,and 7 were digit is used at most if the number must be odd

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