Seven pieces of table lamps with different shades A, B, C, D, X, Y & Z - are to be arranged along one wall of a show room for display. Each lamp must be placed along the wall at one of seven electrical outlets, numbered one through seven consecutively, according to the following conditions. A must be package an outlet adjacent to the outlet at which X is placed. B must be placed at an outlet that is adjacent to an outlet at which either D or Y is placed. Z cannot be placed at an outlet adjacent to the outlet at which C is placed. C must be placed at outlet number two. If A is placed at outlet seven, which of the following must be true?
A. X is placed at outlet five
B. B is placed at outlet three
C. Z is placed at outlet five
D. D is placed at outlet four
E. Y is placed at outlet one
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Explanation: If A is at 7, X will be at 6. Z cannot be in 1 or 3. (B, Y) or (D, Y) will be adjacent. So they will take 3 and 4. So Z must be on 5.
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