国际顶尖MBA申请交流平台--TOPWAY MBA

标题: 一道DS,帮帮忙!! [打印本页]

作者: jojofgasw 时间: 2004-10-4 20:18 标题: 一道DS,帮帮忙!!

刚接触,题很简单,不要笑我!!

1/A+1/B+1/C=?

STATE1):ABC=24

STATE2):AB+BC+AC=26

答案选1+2,为什么不是2??

谢谢!!!

作者: teyvhf 时间: 2004-10-4 20:24

1) abc = 24

2) ab + bc + ac = 6, by dividing abc on both sides, we can get 1/c + 1/a + 1/b = 6/abc, thus it's not sufficient to tell what the answer is(since we have no idea what 6/abc is whithout knowing 1)), thus 2) is not suffiicent by itself

and 1) and 2) are needed in order to know the answer

thus the answer is C <= thanx susan

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