求助一道GRE数学题!
Inagroupof100students,morestudentsareontheFencingteamthanaremembersoftheFrenchclub.If70areinthecluband20areneitherontheteamnorintheclub,what,istheminimumnumberofstudentswhocould,bebothontheteamandintheclub?
A10B49C50D60E61
求解析!
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