# The highest common factor of two co-prime numbers will be :

**Answer: (2) 1**

**Explanation:-**

Let the two co – prime numbers be 8 and 9

Then, the factors of 8 = 1 x 2 x 2 x 2

And the factors of 9 = 1 x 3 x 3

Highest common factor = 1

Then, the highest common factor of two co – prime numbers will be 1.

Hence, the answer is (2) 1.