About Venn Diagrams and set notation. Does a "minus P" mean minus the overlap or all of "P"? Example Triple Venn of K, P and M. K has 15 people, 6 of which overlap with P. P has 7 people, 6 of which over lap with K. If M union K = 12, would MUK - P = 6 or 5?

Question

About Venn Diagrams and set notation.  Does a "minus P" mean minus the overlap or all of  "P"? Example  Triple Venn of K, P and M.  K has 15 people, 6 of which overlap with P. P has 7 people, 6 of which over lap with K.   If M union K = 12, would MUK - P = 6 or 5?

owlfred · Answer

Hoot! You just asked your first question! Hang tight while I find people to answer it for you. You can thank people who give you good answers by clicking the 'Good Answer' button on the right!

anonymous · Answer

I don't see a good answer button.

anonymous · Answer

$$M \bigcup K \setminus P$$ would be the set of everything that is in M and K but not in P.

anonymous · Answer

We can't know how many from P are in M union K without knowing more about M.

anonymous · Answer

I'll try to attach file

anonymous · Answer

attachment

amistre64 · Answer

hit f5 to refresh your browser and the good answer button should appear

anonymous · Answer

thanks

amistre64 · Answer

-P tends to mean (notP)

anonymous · Answer

So it would be minus 7 in this Venn, not minus 6?

amistre64 · Answer

notP = {1,3,8}

amistre64 · Answer

subtract P from the union of MK right?

anonymous · Answer

yes

anonymous · Answer

Basically we can see that there is only 1 element that is in M AND K but not in P

anonymous · Answer

Ah, I see the numbers are not treated as numbers so to speak, but members of the set.

amistre64 · Answer

Does it want MuK or MnK?

anonymous · Answer

No, I think it's the cardinality of the set.

anonymous · Answer

The question is show those with just M, just K or just M & K.

anonymous · Answer

Or I suppose you can interpret it as the elements.

amistre64 · Answer

M union K is the set of all the elements of both M and K: MuK, MorK

M intersect K is the set of only the common elements: MnK, MandK

amistre64 · Answer

MuK - P = {8,1,3}

MnK - P = {1}

anonymous · Answer

Elements - yes bc MUK is {8,1,3,2,4}   P = {1,2,4}  MUK - P would be {8, 1,3,2,4} - {1,2,4} (where the 1s are different elements) leaving {8,1,3}.

anonymous · Answer

Ack. Sorry union is or. not and

amistre64 · Answer

exactly :)

anonymous · Answer

I need to get more sleep.

amistre64 · Answer

and more fiber :)

anonymous · Answer

if by fiber you mean coffee I agree.

anonymous · Answer

Thank you your answer clarified this in a more important way than this single question.  We have to relook at the set notation chapter.

amistre64 · Answer

yw and good luck :)