It can't be one. Mixed numbers are greater than 1.
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17/12 = 1 5/12
12/11 = 11/11
18/12 is an improper fraction. It's equivalent to the mixed number 1.5 .
They can't be simplified as a fraction, but can be changed to a mixed number to give 5 and 7 over 12.
The answer would be 11 over 12 and it can't be changed into a mixed fraction since it isn't an improper fraction unless you meant 72 over 66. Then the answer would be 1 whole and 1 over 11.