问几道数学钩钩

angelwds · 发表于 2009-11-8 15:34:19

13号考试。。下午刚开始开钩钩~。。哎。。问几道数学吧先。。和答案算的不一样

13、{1,4,6, b, e} be不为0整数，五个数字中选2个组成两位数，重复的有25个，不重复的20个，不重复的这20个两位数的和为1056=44x24，求b+e的值

不太明白这题说重复的有25个，不重复的有20个有什么意义.。。如果说BE两个数不一样，那能组成数的总个数也就是A52=20个。。怎么可能租出25个数来

33、PS:a1,a2,a3,a4,....，An 是an-2除以an-1的余数，然后说a4=0,a3=6，问a1
A
。42
B。45
C。48
这题貌似42、48都成吧。。。

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
这题我选C。。答案给的E。。我算出的最后答案是30%

eling820 · 发表于 2009-11-8 15:37:00

53是C啊

angelwds · 发表于 2009-11-8 15:38:36

呵呵汇总的答案给的是E嘛。。所以想问问啦

angelwds · 发表于 2009-11-8 18:54:54

ding ..

问几道数学钩钩

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