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June 21st, 2012, 05:18 AM  #1 
Newbie Joined: Jun 2012 From: MalmÃ¶ Posts: 4 Thanks: 0 Math Focus: Trigonometry  minor sets sets problem
Hello guys! I have decided to study some maths this summer and I have encountered my first problem which I do not understand. It's simple, I know, but I cannot understand the answer. So we have a venn diagram. M contains:{1,2,4,6,8} and N contains: {6,7,8,9}. They intersect so: {6,8} The question is to find M´ U N´. The answer is : {1,2,4,7,9}. Why? 
June 21st, 2012, 01:11 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,730 Thanks: 689  Re: minor sets sets problem
The problem is a little ambiguous, since the whole space (possibilities: all integers, all integers from 1 to 9, M?N) is not defined. Based on the answer, the whole space appears to be M?N = (1,2,4,6,7,8,9). Therefore M' = (7,9) and N' = (1,2,4). Take the union to get the answer. 

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