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Practice problem

Probability: Inclusion-Exclusion Principle

By Benjamin Qi
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In a class, 1717 students had at least one brother; 1818 students had at least one sister; 66 students had at least one brother and one sister; 55 students had neither a brother nor sister. How many students are there in this class?

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Type a concept, like “slope” or “photosynthesis”.

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