这是一道GRE数学概率题,题我读懂了,
Foracertainprobabilityexperiment,theprobabilitythateventAwilloccuris1/2andtheprobabilitythateventBwilloccuris1/3WhichofthefollowingvaluescouldbetheprobabilitythattheeventA∪B(thatis,theeventAorB,orboth)willoccur?Indicateallsuchvalues.A.1/3B.1/2C.3/4