## anonymous one year ago Help!!! Whats the difference between.....

1. anonymous

|dw:1437470610142:dw|

2. kropot72

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3. anonymous

yes yes but whats the DIFFERENCE?|dw:1437470805001:dw|

4. anonymous

When shown in the venn diagram they are the same?

5. kropot72

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6. UsukiDoll

the symbol U is set union so in that venn diagram for A U B' it means A or NOT B

7. UsukiDoll

that upside down U is set intersection... so in that venn diagram for A upside down U B' it means A AND NOT B.

8. UsukiDoll

AND is both we have to take A and NOT B into consideration. We can't drop one of them

9. anonymous

yes but when drawn are they the same?

10. anonymous

|dw:1437471098586:dw|

11. UsukiDoll

hmm I know if I do sets... like numbers A = 1 2 3 B = 1 2 A U B is 1 2 3 which is all the elements if A upside down U B then it's what do they have in common and that's just 1 and 2 Oh I see what the problem is ... isn't that for NOT B or NOT A the outside of the circle gets shaded or something

12. anonymous

I think thats wrong

13. UsukiDoll

Not B stuff should be shaded outside the circle

14. anonymous

Nope this is|dw:1437471596528:dw| is this right?

15. UsukiDoll

no... you got the A but look at the middle part It's A AND NOT B B' means NOT B

16. anonymous

NOT B so it doesnt get shaded

17. UsukiDoll

NOT B the result is SHADED OUTSIDE!

18. anonymous

and it intersect with A so inside part

19. UsukiDoll

you only have part of it.

20. anonymous

What?|dw:1437471898711:dw|

21. kropot72

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22. zzr0ck3r

B' means B compliment

23. anonymous

yeah so|dw:1437472295052:dw|

24. UsukiDoll

No it's not the same.. for A U B' A is shaded B' is shaded

25. UsukiDoll

A U B' is A or NOT B so the circle A is shaded the outside part of B is shaded

26. UsukiDoll

|dw:1437472448194:dw|

27. UsukiDoll

|dw:1437472478843:dw| so my A is shaded

28. UsukiDoll

29. anonymous

Oh right.Thats what I asked for 20 minutes

30. UsukiDoll

venn diagrams are unique... they don't share the same picture.

31. anonymous

but esy to understand

32. UsukiDoll

|dw:1437472598710:dw| that's the intersection one of A AND NOT B (only something in common is shaded) |dw:1437472632510:dw| that's the union. A OR NOT B (so shade everything that's being considered. A is shaded and NOT B is shaded)

33. UsukiDoll

I guess.. I drew these before and I'm doing them again for the upcoming semester. I was always a huge fan of the U problems... like A U B is A OR B

34. anonymous

Alright thanks

35. UsukiDoll

so anything to do with NOT is shade outside. like for the NOT B we don't shade the circle, we shade around the circle (outside - borders)