Answer:
604
Explanation:
Recall that the Natural Numbers consist of the set of positive integers. Therefore, the minimum value of a is "1", and its maximum value is 511 (it has to be smaller than 512)
On the other hand, "b" has its minimum value as 513 (must be larger than 512); and has its maximum value as 607.
Then the maximum possible value of a + b would be: 511 + 607 = 1118
and the minimum possible value of a + b is given by: 1 + 513 = 514.
And the difference between these two numbers is:
1118 - 514 = 604