Question

a and b are 2 positive integers 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

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

Answer 2

Answer:

The LCM of 3 & 5 is 15 so answer is 15

Step-by-step explanation: