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There are 7 medicines A, B, C, D, E, F, and G. A and B [#permalink]
16 Jun 2005, 20:28
100% (04:06) correct
0% (00:00) wrong based on 1 sessions
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There are 7 medicines A, B, C, D, E, F, and G. A and B cannot be used at the same time, otherwise it would produce side effect. How many ways are possible that 3 medicines can be used without producing side effect?