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Question: In a party for 30 young children, 12 were served with Coca-Cola drink, while 14 were served with Pepsi-Cola. If 9 children were served with Coca-Cola, but not with Pepsi-Cola, find:

i. The number of children served with both drinks;

ii. The number of children served with at least one type of drink;

iii. The number of children not served with any of the drinks.

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