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39 would come out to be XXXIX. The "X" means 10. You can add a letter to itself up to 3 times. So 30 is just "XXX." in order to get 9 you can't do VIIII because then you are using 4 ones when only 3 are allowed. So you must subtract 1 from 10 by putting the smaller before the bigger. IX is 9 (1 subtracted from 10). When put all together you get XXXIX

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11y ago

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