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Combination problem [#permalink]
18 Jul 2006, 06:28
Can anyone please answer and explain the following question -
To furnish a room in a model house, an interior decorator is to select 2 chairs and 2 tables from a collection of chairs and tables in a warehouse that are all different from each other. If there are 5 chairs in the warehouse and if 150 different combinations are possible, how mnay tables are in the warehouse?