Question

a and b are 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 b is 5.then calculate the leastbprime factor of (a+b).

Answer 1

a= 3x

b= 5y

a+ b= 3x + 5y

Now Here 3 and 5 are least prime

As we know only 2 is even prime

So here in both 2 can't be factor

So both terms become odd

As odd+ odd is even

So Least prime factor is 2

Answer 2

Answer: 2

Step-by-step explanation:

Let a = 3q (where q>3) and

b = 5r (where r>5)

As minimum factor for a is 3 and b is 5, r and q are not even as it would make 2 as the smallest factor

Therefore, 3q and 5r are odd numbers.

A + B = 3q + 5r

=2m (odd + odd = even and m shows that the sum is a multiple of 2)

So, the smallest factor for a + b is 2

Plz mark as the brainliest answer