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out of 20 members in a family 10 likes to take st and 13 likes copy assume that each one likes at least one of the two drinks how many likes (i) both tea and coffee (ii) only tea not coffee

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"Out of 20 members in a family 10 likes to take tea and 13 likes coffee. Assume that each one likes at least one of the two drinks how many likes (i) both tea and coffee (ii) only tea not coffee"
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n(total) = 20
n(T) = 10
n(C) = 13
Now, n(Total) = n(T) + n(C) - n(TUC)
Therefore, n(TUC) = (10+13) - (20)= 3
Now, those who drink only tea= 10-3 = 7
Those who drink only coffee = 13-3 = 3
Answer :
(i) 3
(ii) 7
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