Calculate probability a student takes mathematics or physics.
\( \begin{array}{l}\textbf{In a two-way table of 150 students, 75 take mathematics,} \\ \textbf{50 take physics, and 30 take both. What is the} \\ \textbf{probability that a student takes either mathematics or physics?}\end{array} \)
Choose one option:
Add counts, subtract overlap, divide by total students.
Use inclusion-exclusion principle to avoid double-counting students who take both subjects.
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