Mathematics · Set Theory
Students in a college have to choose at least two subjects from chemistry, mathematics, and physics. The number of students choosing all three subjects is 18, choosing mathematics as one of their subjects is 23, and choosing physics as one of their subjects is 25. The smallest possible number of students who could choose chemistry as one of their subjects is:
- 121
- 219
- 322
- 420✓
Correct answer
20
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