There are 7 senior students and 9 junior students in... 3 : PS Archive
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There are 7 senior students and 9 junior students in... 3

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Joined: 07 Nov 2004
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There are 7 senior students and 9 junior students in... 3 [#permalink]

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06 Jan 2005, 15:20
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There are 7 senior students and 9 junior students in... 3 students are to be selected to compose a committee. Among the 3 students, at least one is senior and one is junior. How many such committees are possible?
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Joined: 18 Nov 2004
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06 Jan 2005, 15:38
441 ways

2 scenarios

1) 1 jr + 2 sr = 9x7C2 = 189

2) 1sr + 2 jr = 7x9C2 = 36x7 = 252

Total = 441
06 Jan 2005, 15:38
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