The HCF is the largest number that both numbers can be divided by. If the HCF is 1, that would suggest that the two numbers share no prime factors. Thus, any two numbers which are coprime will have an HCF of 1. Consecutive numbers are good examples here - 15 and 16, 27 and 28, 104 and 105, all have an HCF of 1.
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You need at least two numbers to find a GCF.
HCF is the highest common factor of two or more numbers. As they 9 and 11 are co-primes hence HCF is 1.
To have a HCF, you need at least 2 numbers. There is no HCF in just 1 number.
Relatively prime or co-prime.
The GCF of two consecutive numbers is always 1. The GCF of any set of numbers can't be greater than the smallest of the differences between the numbers.