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If \(A + B = 5, B + C = 4,\) and \(C + D = 6,\) then \(AB + CD + AC + BD\) is:
A) 11
B) 12
C) 15
D) 28
E) 48
Answer: D
Source: Economist
A) 11
B) 12
C) 15
D) 28
E) 48
Answer: D
Source: Economist
