Final answer:
The formula for the number of terms in a set of consecutive integers that includes only one of its endpoints, but not both, is n-1, where n is the difference between the two endpoints.
Step-by-step explanation:
To find the formula for the number of terms in a set of consecutive integers that includes only one of its endpoints, but not both, we can use the formula n-1, where n is the difference between the two endpoints. This can be derived by considering that in a set of consecutive integers, the number of terms is equal to the difference between the endpoints plus 1 (since we are including one endpoint), and then subtracting 1 to exclude the other endpoint. For example, if the set is [1, 2, 3, 4], the difference between the endpoints is 4-1=3, so the number of terms is 3-1=2.