This question shows conditional probability with overlapping preferences.
\( \begin{array}{l}\text{In a class of 30 students:} \\ \text{15 students prefer math, 10 prefer science, and 5 prefer both.} \\ \text{If a student is chosen at random, what is the probability they prefer math, given that they prefer science?}\end{array} \)
Choose one option:
Only count the students who satisfy the condition, then compute the fraction.
Focus on the subgroup defined by the condition (science) to compute probability of math preference.
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