Question

if the least prime factor of a is 3 and the least prime factor of B is 7 then find least prime factor of(a+b)

(CH 1 grade 10th)

Answer 1

Hello.

Here a and b is always be odd.( else 2 will be it's least prime factor.

Now the sum of two odd no.s is even.

So, a+b is even.

It's least prime factor will be 2.

Hope it helps