Question

Which pairs are not co-prime number?

• A. $22,44$
• B. $13,97$
• C. $175,221$
• D. $73,37$.

Answer 1

The correct option is A $22,44$

Two numbers are said to be co-prime numbers they have no common factor other than one.

(i) $44=2\times 22,22=22\times 1$

$22,44$ have a common factor $22$

So, $22,44$ are not co-prime numbers

(ii) $13,97$ have a common factor $1$

So, $13,97$ are co-prime numbers

(iii) $175,221$ have a common factor $1$

So, $175,221$ are co-prime numbers

(iv) $73,37$ have a common factor $1$

So, $73,37$ are co-prime numbers

Hence out of all options only $Opt:\left[A\right]$ has the numbers that are not co-primes