A∩C=2,4,6,8.
A∪C=1,2,3,4,5,6,7,8,9,10,12,14,16,18,20.
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A∩C=2,4,6,8.
A∪C=1,2,3,4,5,6,7,8,9,10,12,14,16,18,20.