For a number '4', the smallest factor is , and the greatest factor is .
The difference between the smallest and greatest prime factor of 200 is:
A number a has 7 as its smallest prime factor, and another number b has 3 as its smallest prime factor. What is the smallest prime factor of the number a−b?
A number a has 3 as its smallest prime factor, and another number b has 5 as its smallest prime factor. What is the smallest prime factor of the number a+b?