Question

A and b are two positive integers such that the least prime factor of a is 3 and least prime factor of b is 5 tgen calculate least prime factor of a+b

Answer 1

Let a = 3x, b = 5y

Therefore, a + b = 3x + 5y

Observe that both the terms are odd numbers. When you add two odd numbers, the resulting sum will always be an even number. Hence, the least prime factor of a + b is 2

Hope It helps you

Answer 2

5+3=8

Its prime factors = 2×2×2

Therefore least prime factor of a+b=2