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metallicafan
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Each of the terms in sets R, S, and T are positive integers. If 9 of the integers in R are also in S, 12 of the integers that are in S are also T, and 4 of the integers that are in R are also in T, how many unique positive integers are contained in the three sets?
(1) 1 of the integers is in R, S, and T.
(2) R has 20 terms, S has 24 terms, and T has 30 terms.
(1) 1 of the integers is in R, S, and T.
(2) R has 20 terms, S has 24 terms, and T has 30 terms.
