The answer is 10.
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11 and 9 is a factor pair for 99. 11 and x^9 is a factor pair for 11x^9.
11 and 110 are not relatively prime because they have 11 as a common factor.
A number with only one factor pair is........ a prime number for example 11 the only factor pair is one times 11.
It is: 110/121 = 10/11 by dividing the numerator and denominator by their highest common factor which is 11
11 and 22, among others.