/r/learnmath
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Tuples: How many integer numbers between 0 and 9999 are there that have one digit 1 and at the same time one digit 3?
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I have been struggling with this problem for awhile and we are yet to study formulas for combinatorics with repetitions. Is there any other way to solve it?
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Mark as read: Add to a list
Mark as read: Add to a list