How to find the union of a Venn Diagram Practice Test - ACT

Sixty high school seniors were polled to see if they were taking history and calculus. A total of 29 students said they were taking calculus, and a total of 50 students said they were taking history. What is the minimum number of students who take both history and calculus?

Given the Venn diagram below, which of the following does not belong to $A \cup B$ ?

Sixty high school seniors were polled to see if they were taking history and calculus. A total of 29 students said they were taking calculus, and a total of 50 students said they were taking history. What is the minimum number of students who take both history and calculus?

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Given the Venn diagram below, which of the following does not belong to ?

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Given the Venn diagram below, which of the following does not belong to $A \cup B$ ?