The factors of 81 that are between 2 and 10 are 3 and 9.
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1 and 81 Those two numbers certainly divide into 81 though they are not the only numbers to do so.
Just 3.
Divide both numbers by 9 (a factor of both 72 and 81) and you get 8/9
1
The numbers are co-prime so the only common factor is 1.