Posted: 5/20/2011 8:06:45 AM EDT
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I have a problem in my math homework that goes: Let U = {1, 2, 3, 4, 5, 6, 7,8, 9, 10}, A= {3, 4, 5}, and B= {5, 6, 7} Find A - B. Either the teacher didn't cover it or I was looking down when he explained it, but I don't see how to subtract B from A when B is not a subset of A. An explanation would be greatly appreciated. |
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Quoted:
Quoted:
"A union B" is the combination of A and B = {3,4,5,6,7} "A intersection B" is the common overlap of A and B = {5} "A subtract B" is all elements only in A = {3,4} "A disjunction B" is all elements in either A or B but not both = {3,4,6,7} Indeed. |