Q: How can you make 45 using only the numbers 1-9 only once?

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-9

36 - 18

(5+7)*(5-3)=12*2=24

Yes you can do that

8 of them.

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3! = 6.

4*3*2 = 24 of them.

8

only using the numbers once

None.

If you want 4-digit numbers, there are 24 of them.

998,000

2,5,13,647,809

(7 + 5 - 9) x 8 = 24

There is only one combination. In a combination the order of the numbers does not matter so the only combination is 0123456789. This is the same as 1326458097

(6 x 13) - (6 x 9) = 78 - 54 = 24

-9