[求助]【费费数学宝典】详解版: P15-18

lilly58 · 发表于 2004-4-1 00:41:00

I have serious double on the explanation:

It mentioned in the question that AB and BC and AC all equal 10%; thus, the equaltion should be 35%+45++40-3*10%+X=1..

Is there anything wrong with my interpretation??

Please help..

donna · 发表于 2004-4-1 12:19:00

MM忘记考虑三种都有的概率问题．

lilly58 · 发表于 2004-4-6 00:50:00

I still don't understand this..

Terry-tin interpreted this as 35%+45%+40%-10%-3X+X=1.

My questions:

1.why it's 10% instead of 3*10%? (AB or AC or BC)

2. why -3X? (where is this from anyway as X is ABC?)

Please help clarify.

[求助]【费费数学宝典】详解版: P15-18

[求助]【费费数学宝典】详解版: P15-18

所属分类: GMAT考试

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