Question

If 3 is the least prime factor of a positive number a and 7 is the
least prime factor of a positive number b, then the least prime
factor of a + b​

Answer 1

Answer:

2

Step-by-step explanation:

Since, 3 is the least prime factor of 'a' therefore the number 'a' must be odd (because if the numbers would have been even then the least prime factor will definitely be 'z'.)

So, a is odd. similarly, b is also odd.

Hence a+b is even (than is, a multiple of 2)

Thus the least prime factor of 'a+b' is 2.