Question

a and b are two positive integers such that the least prime factor of a is 3 and the least prime factor of b is 5. then calculate the least prime factor of (a+b)​

Answer 1

Answer:

Least prime factor being 3 or 5 means that 2 is not a factor. So the numbers are both odd.

Odd + odd = even for sure. So for a+b we have 2 as a prime factor.

Since 2 is the smallest prime, answer is 2. hope it helpss : D