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
GRE数学题（详见补充）A survey of 100 persons revealed that 72 of them
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