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Suppose in a group of 100 persons 80 tak...

Suppose in a group of 100 persons 80 take tea, 30 take coffee and 20 take both tea and coffee. Suppose T denotes the set of all persons in the group taking tea and C denotes the set of all persons in the group taking coffee.
Fill in the blanks
n(T) = -----, n(C) = -----, `n(T cap C)` = -----

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