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A science student has exactly four flasks---1,2,3 and 4---originally containing a red, a blue, a green and an orange chemical, respectively. An experiment consists of mixing exactly two of these chemicals together by completely emptying the contents of one of the flasks into another of the flasks. The following conditions apply:
The product of an experiment cannot be used in further experiments.
Mixing the contents of 1 and 2 produces a red chemical.
Mixing the contents of 2 and 3 produces an orange chemical.
Mixing the contents of 3 with the contents of either 1 or 4 produces a blue chemical.
Mixing the contents of 4 with the contents of either 1 or 2 produces a green chemical.
(24) If the studnet performs exactly two experiments and exactly one of the resulting two nonempty flasks contains an orange chemical then it must be true that the contents of the other nonempty flask is
(A) obtained by mixing flasks 1 and 2 (B) obtained by mixing flasks 2 and 4 (C) blue (D) green (E) red
my answer: D book answer: B | 
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发表于 2005-3-13 07:24:00
