Question

Choose the pair of co-prime numbers. [1 Mark]

a. 6 and 8
b. 15 and 40
c. 18 and 35
d. 20 and 100

Answer 1

Two numbers are said to be co-prime if they have no common factor other than 1.
Out of all the options only option C 18 and 35 have no common factor except 1.
So, 18 and 35 are co-prime numbers. [1 Mark]