how to find

A probability experiment is conducted in which the sample space of the experiment is S = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15). Let event A = (4, 5, 6, 7} and event B = (6, 7, 8, 9, 10). Assume that each outcome is equally likely. List the outcomes in A or B. Find P(A or B)