Question

Find the number of passible pair if the product of 2 no is 84 and their hcf is 2

Answer 1

HCF= 2

So numbers are 2x and 2y

ATQ

2x×2y= 84

4xy=84

xy= 21

x y 's co prime values = (1,21,)(3,7)

So total pair is 2.