Q. 114.5( 2 Votes )

In a group of 30

Answer :

Given in a group of 30 persons, each one


takes at least one of the drinks.


So n(TC) = 30


n(T) = 18



Also given that number of persons drink only tea is 10.


There fore, number of persons drink both tea and coffee


n(TC) = n(T)–10 = 18–10 = 8


From the Venn diagram,


30 = 10 + 8 + x


x = 30 – 18


= 12


Number of persons drink only coffee not tea is 12.


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