GRE数学题(详见补充)
Asurveyof100personsrevealedthat72ofthemhadeatenatrestaurantPandthat52ofthemhadeatenatrestaurantQ.WhichofthefollowingcouldnotbethenumberofpersonsinthesurveyedgroupwhohadeatenatbothPand
A.20B.24C.30D.50E.52