In a survey of 100 people 80 watch tv series friends but 70 people watch tv series got so how many people watch both the series
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A u B = n*A + n*B - A intersection B
100 = 80+ 70 - A and B both
100 - 150 = - (A and B both )
- 50 = - ( A and B both )
A and B both = 50
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