Question

If two numbers are co-primes, at least one of them must be prime.

• A. True, True, False
• B. False, False, True

Answer 1

The correct option is B False

Co-Prime numbers are those numbers whose common factor is only one ie. $1$.

Now, $9$ and $4$ are co-prime numbers as the only common factor between them is $1$ but none of them are prime. Hence, the given statement is false.