প্রশ্ন ও সমাধান

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?