Question

a and b are two positive integer such that the least prime factor of a is 3 and least prime factor of B is 5 then calculate the least prime factor of a + b

Answer 1

★ REAL NUMBERS ★

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

Now, $Odd + Odd = Even$,
So, for a+b we have 2 as a prime factor. 


Since 2 is the smallest prime, answer is 2.