推 giyoshi:我算是480 @@"..... 09/11 15:37
推 giyoshi:算法是1200 X %數 得出A B C 與 A交集B 然後用 09/11 15:41
→ giyoshi:全部扣掉A聯集B 09/11 15:41
3.There are 1,200 respondents in a survey.
And they are divided into three groups,
such as A, B and C with percentage of
54%, 36% and 42%(數字抄的夢飛翔的，感覺好像有點出入)
respectively (numbers may not be accurate).
The percentage of A and B is 30%,
what is the maximum number of C that is neither in A nor B.
這類題目列式怎麼列？
感謝～
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