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1998 WAEC Mathematics Theory A, B and C are subsets of the universal set U such that : \(U...

Mathematics
WAEC 1998

A, B and C are subsets of the universal set U such that : \(U = {0, 1, 2, 3,..., 12}; A = {x : 0 \leq x \leq 7}; B = {4, 6, 8, 10, 12}; C = {1 < y < 8}\), where y is a prime number.

(a) Draw a venn diagram to illustrate the information given above;

(b) Find: (i) \((B \cup C)'\); (ii) \(A' \cap B \cap C\).

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Explanation

(a) 

(b)  A = {0, 1, 2, 3, 4, 5, 6, 7}

 B = {4, 6, 8, 10, 12}

 C = {2, 3, 5, 7}

U = {0,1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}

(i) \(B \cup C = {2, 3, 4, 5, 6, 7, 8, 10, 12}\)

   \((B \cup C)' = {0, 1, 9, 11}\)

(ii) \(A' = {8, 9, 10, 11, 12}\)

\(A' \cap B \cap C = { }\)


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