Abag contains 15 marbles numbered from 1 to 15. two marbles are selected from the bag at the same time. let event e = the two numbers do not differ by 10 how many outcomes are in the complement of e?

When we say, complement of event E, where E is such that the numbers will not have a difference of 10, we mean to determine the number of outcomes in which the numbers randomly picked will have a difference of 10. These pairs are 15 and 5, 14 and 4, 13 and 3, 12 and 2, 11 and 1. Thus, there are 5 complements of E.