Two numbers which have only 1 as their common factor are called as:

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Co-prime numbers

Twin-prime numbers

Composite numbers

None of the above

answer is A.

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Detailed Solution

Concept- To solve this question, first we need to understand what a prime number is, i.e.,
A prime number is such a number whose only factors are 1 and the number itself, or, a number that is divisible only by itself and 1, for example, 2 is a prime number since it is only divisible by 1 and itself, and so is 3 which is divisible by 1 and itself.
Now if two prime numbers are paired in a set, the only similarity between them will be that, 1 is a common factor of both. Finally, we will need to know the name of this condition to obtain our desired answer.
Two numbers which have only 1 as their common factor are called "Co-prime" numbers, For example, 2 and 3 are co-prime numbers, since both 2 and 3 are prime numbers themselves and have 1 as their only common factor.
Hence, the correct answer is option 1.

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