Every number except zero is a factor of every other number. Usually this kind of question is intended as a question about integral factors, those that can be paired with another integer to produce the number as a product. In that sense, 9 is not an integral factor of 11, because the paired number with 9 is 11/9, a number that is not an integer.
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11 is a prime number, meaning its only factors are 1 and itself. So, the greatest common factor of 9 and 11 is 1.
99 9, 11 3, 3, 11
The GCF of 9 and 11 is 1.The factors of 9 are 1, 3, 9.The factors of 11 are 1, 11.The GCF of 9 and 11 = 1.Has to be 1 cuz 11 is prime
A factor = number which can be divided into the given number with no remainder eg 3, 9, 11, 33, 99 the factor of 99 is 9.
HCF is the highest common factor of two or more numbers. As they 9 and 11 are co-primes hence HCF is 1.