Probability rules

What the problems look like

A few statements from this skill. Answers, hints and worked solutions live in the practice session.

1. Warm-up

   In a class of $27$ students, $13$ take Spanish, $12$ take French, and $2$ take both languages. A student is chosen at random from the class. What is the probability that the student takes Spanish or French? Give the answer as a fraction in lowest terms.

2. Warm-up

   In a class of $31$ students, $18$ take Spanish, $13$ take French, and $4$ take both languages. A student is chosen at random from the class. What is the probability that the student takes Spanish or French? Give the answer as a fraction in lowest terms.

3. Warm-up

   In a class of $40$ students, $13$ take Spanish, $5$ take French, and $5$ take both languages. A student is chosen at random from the class. What is the probability that the student takes Spanish or French? Give the answer as a fraction in lowest terms.

Problems shown under their original terms: Generated (template, solver-computed).