Question

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

Answer 1

Answer:

Since 3 is a least prime factor of a, we can say that a is odd. Similarly, 7 is the least prime factor of b, making it odd too. So the sum a+b is even and hence it's least prime factor is 2.