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Asked by ken

how many 7 digit numbers can be formed with the numbers 1, 2, 4, 7. (they are in brackets). the question wants two parts. (a) if the numbers can be repeared and (b) if repetation is not allowed
16 years ago

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Answered by drwls
Any of 4 numbers can be selected 7 times in a row. The answer is 4^7 = 16,384
16 years ago

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