GRE数学题(详见补充)
来源:学生作业帮 编辑:神马作文网作业帮 分类:英语作业 时间:2024/11/17 09:07:15
GRE数学题(详见补充)
A survey of 100 persons revealed that 72 of them had eaten at restaurant P and that 52 of them had eaten at restaurant Q.Which of the following could not be the number of persons in the surveyed group who had eaten at both P and
A.20 B.24 C.30 D.50 E.52
A survey of 100 persons revealed that 72 of them had eaten at restaurant P and that 52 of them had eaten at restaurant Q.Which of the following could not be the number of persons in the surveyed group who had eaten at both P and
A.20 B.24 C.30 D.50 E.52
72人有去过P
52人有去过Q
设X是P+Q都去过的人数
(72-X)是只去过P
(52-X)是只去过Q
列出不等式:(总人数须少於或等於100),另外X须少於等於52
X+72-X+52-X
再问: 124 - x
52人有去过Q
设X是P+Q都去过的人数
(72-X)是只去过P
(52-X)是只去过Q
列出不等式:(总人数须少於或等於100),另外X须少於等於52
X+72-X+52-X
再问: 124 - x