# 數學 集的問題

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• 1 decade ago

x belongs to set A and set B.

therefore, x belongs to the intersection of set A and B

x belongs to {4,5,6}

but x does not belong to set C

=>x belongs to the intersection of {4,5,6} and C'

x belongs to the set {5}

x=5

i.e. x belongs to set D, E ,but not F