1. (10C1)x(9C3)x7!/4!x9/10=158760
2. (10C2)x(8C3)x7!/2!/2!x9/10=2857680
1. (10C1)x(9C3)x7!/4!x9/10=158760
2. (10C2)x(8C3)x7!/2!/2!x9/10=2857680
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these two answers are right
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04/13/2012 postreply
17:21:26
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