Jul 20th, 2004, 19:27 | #1 |
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这个数学题怎么做?
4.1 班有46人,会钢琴的有30人,小提琴的有28人,这个班 会钢琴的又会小提琴的有多少人? |
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Jul 24th, 2004, 18:01 | 只看该作者 #7 | |
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Yes, what you said is more precise. If there are some students in the class who can neither play piano nor violin, then there will be more than one answer (17 probabilities: 12 to 28). But if everyone in the class can play either piano or violin, then there will be only one answer (12). Actually, the latter is more likely. 引用:
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