一道英文数学题
Asamplespaceconsistsonlyof2events,AandB.WhichofthefollowingwouldweusetodescribeAandBiftheycannotoccuratthesametime?
a.Mutuallyexclusive
b.P(AandB)=0
c.Collectivelyexhaustive
d.Alloftheabove
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