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If there are 20 people who don't like tea and 30 people who don't like coffee. And 10 people who
don't like either of the two. How many people are we talking about if20 like both tea and coffee?
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Answer:
the answer is 80 because 20+30+10+20
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Answer:
no. of people who don't like tea n(t)=20
no. of people who don't like coffee n(c)=30
no. of people who don't like both coffee as well as tea n(t ∪ c)=10
no. of people like both coffee and tea n( t ∩ c)=20
total no. of people n(u)=?
n(u)=n(t)+n(c)-n(t n c)+n(t u c)
= 20+30-10+20
=70-10
=60
hence, n(U)=60
i hope it is useful
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