Calculate probability a student studies Chemistry or Biology.
\( \begin{array}{l}\textbf{In a survey of 600 students, 350 study Chemistry,} \\ \textbf{280 study Biology, and 150 study both. What is the} \\ \textbf{probability that a student studies Chemistry or Biology?}\end{array} \)
Choose one option:
Add counts, subtract overlap, divide by total students.
Use inclusion-exclusion to avoid double-counting students who study both subjects.
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