Math
1 数学鸡: 上下两个全等平行四边形,AF∥BE∥CD,AB∥EF,BC∥ ED,ABCDEF整个周长为42,X°=Y°=60,求 FD的长度.
2,(PREP) A committee of 3 people is to be chosen from 4 married couples,what is the number of different committeess can be chosen if two peoplewho are married to each other cannot both served on the committee?
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第一个我觉得题目不完整,特别是周长的表述和那个角度。
第二个是C34*C12*C12*C12
先从四对夫妇里抽三对,然后从每队夫妇里取一个。
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