Question

What is the H.C.F. of two co-prime numbers ?

• A. $1$
• B. $0$
• C. $2$
• D. none of these

Answer 1

The correct option is A $1$

The two numbers which have only 1 as their common factor are called co-primes.
For example, Factors of $5$ are $1,5$
Factors of $3$ are $1,3$
Common factors is $1$.
$=>HCF=1$