[機經] JJ#53
53、DS：in an organization, 60% people engaged in research, 54% people engaged
in counseling, 30% engaged in teaching. Question: what percent of people in
organization engaged in at least two fields?
1) half of the people who engaged in teaching attend at least two field
2) 20% people of whole organization who engaged in at least two field do not
engaged in teaching
貌似是這樣30% in teaching絕對肯定 兩個條件也肯定，
答案選C,有的人選E ????
解: ( T+R+C) + 2(T&R+T&C+R&C) + 3 (T&R&C) = 1.4, T&R+T&C+R&C+T&R&C =?
1) 0.15 -> T
0.15 = (T&R) + (T&C) + ( T&R&R ) .... not sufficient
2) 0.2 = R&C ....not sufficnet
1)+2) T&R+T&C+R&C +T&R&C= 0.35 ....sufficient => C
傷咖的算法~不過我看不太懂??為什麼有1.4等數字
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