Mathematics, 08.06.2021 14:00 elie84
Let A, B and C be three sets and suppose there is an element belonging to A β B β C.
Then it it's necessarily true that:
A. A βͺ B βͺ C is contained in A βͺ B
B. There is an element that is in A β B but not in C
C. A β B is strictly contained in A β B β C
D. A β B β C is strictly contained in A β B
E. A β B is not the empty set
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Let A, B and C be three sets and suppose there is an element belonging to A β B β C.
Then it it's n...
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