In a survey it was found that 21 people liked product A, 26 liked | Filo
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Class 11

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Co-ordinate Geometry

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In a survey it was found that people liked product A, liked product B and liked product C. If people liked products A and B, people liked products C and A, people liked products B and C and liked all the three products.
Find how many liked product C only

Solution: Let A, B, and C be the set of people who like product A, product B, and product C respectively.

Accordingly,

The Venn diagram for the given problem can be drawn as above.

It can be seen that number of people who like product C only is
 
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