# 數學 集的問題

若A={1.2.3.4.5.6},B={4.5.6.7.8}.C={2.4.6.8.},,D={3.5},E={5.6},F={4.6}:設X代表任一集,而X包含於A,X包含於B.X不包含於C,問D,E,F各集之中,何集相當於X?

### 1 Answer

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- 1 decade agoBest Answer
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

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