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Mathematics, 19.10.2020 14:01 sydneyrasmussen

There are 15 clowns in a circus. Each clown has to act either happy or sad. Twelve of the clowns have red noses. Each of the seven happy clowns has a red nose. Five of the sad clowns have red noses. How many clowns have to act sad and do not have a red nose?

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There are 15 clowns in a circus. Each clown has to act either happy or sad. Twelve of the clowns hav...
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