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A combination question

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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How many 4-digit numbers can be made from the numbers 1,3,5,7,9 and 0 if the numbers can be repeated (Remember - a number cannot start with 0)
You have six digits to work with, each of which can be repeated. So, I'd say your answer is 6*6*6*6 which equals 36*36 which equals 1,296
Nope, its 1080 :/ (remember at 0 cannot be used in the start)

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okay then - sorry
@wolf1728, I got it!
_ * _ * _ *_ The first number can't be 0, so you you have 5 numbers to work with for the first spot. 5 * _ * _ * _ The other ones can repeat, so we can fill the other spots with all numbers - 6 5 * 6 * 6 * 6 = 1080.

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