Examples:
1. Suppose list A contains 30 students in a mathematical class and list B contains t...
Examples:
1. Suppose list A contains 30 students in a mathematical class and list B contains the
35 students in an English class, and suppose there are 20 names on both lists. Find
the number of students:
(a). On list A or B
(b). only on lista
(c). only on list B
(d), on exactly one of the two lists
Answers: 3
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