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Chapter 2.1, Problem 11E Step-by-step solution Step 1 of 1 Open intervals Consider the open interval (a,b), where a and b are integers. Then, the members of the interval include all the integers between a and b, excluding both. In the interval (3,4), 3 and 4 are not included and hence there are no integers in the interval. Hence, there are no members in the interval (3,4).