Question

how many numbers did bill wrote if he wrote all the natural numbers between w and v not including w and v

Answer 1

v - w - 1

Explanation:

Try an experiment with a small, specific set of numbers like:

4, 5, 6, 7, 8, 9, 10 w = 4 and v = 10.

There are 5 numbers in the list, not counting the first and last. Is this related to the difference between v and w? v - w = 6, one more than 5.

The number of natural numbers between w and v, not including w and v, is v - w - 1.