In a group of 70 people 37 like coffee, 50 like tea and each person likes one of the two drinks
then how many people exactly one drink?
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53 People
We know that
A union B = n(A) + n(B) - n ( A intersection B)
here A intersection B refers to the number of people who like both tea as well coffee.
So by subtracting a intersection b from the total number of people we will get the required answer .
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