请教两道JJ

bigmouse

100. 三个考官考30学生，A认为15名过，B认为17名过，C认为18名过。只有三人都过者才叫过，问至少有几人过了。
ans：5
107. 60 cars, either full-size or compact or sports. 31 is white, 10 is red, 19 is blue, how many cars are full-size?
(1). Not all red and blue cars are full-size.
(2). The number of full-size is greater than the sum of compact and sport cars.
[确定]Ans.: C

henry_shao

100.偶认为这题答案为0，可画图得出；
101、这题答案应为E，无法判断，可举例。

chnp

100.2人。取重合度最小的二个：15、17，且因为15+17>18，所以15+17-30=2.

Louisa_xy

15和17的最小重合是2，但是另外18个可能和这个重合的2不重合，没有都通过的。

lisaislisa

I guess the question is wrongly set
it may be 只有2人都过者才叫过
then it should be 3

just my assuming .....no reason...

renali

for100. I think the passed rate for 3 examiner times 30 people is:
(15/30*17/30*18/30)*30=5.1 => 5 people passed the test

I don't know if it's right, please advise

[此贴子已经被作者于2002-12-18 23:33:05编辑过]

[此贴子已经被作者于2002-12-18 23:46:53编辑过]