Discreet math - Set theoretic questions

[fabaho]

Given sets A, B, C and D.
Each volume contains exactly six elements.
Each section of the two of them ( A ? B, A ? C, A ? D, B ? C, B ? D or C ? D)
contains exactly two elements.
a) Give a concrete example showing that this is possible.
b) How many elements contain the amount of (A - B) × (C - D)

 

[pka]

Re: Discrete Math

Given sets A, B, C and D.
Each volume contains exactly six elements.
Each section of the two of them ( A ? B, A ? C, A ? D, B ? C, B ? D or C ? D)
contains exactly two elements.
a) Give a concrete example showing that this is possible.
b) How many elements contain the amount of (A - B) × (C - D)

\(\displaystyle A=\{1,2,3,4,5,6\}\)
\(\displaystyle B=\{1,2,a,b,c,d\}\)
\(\displaystyle C=\{3,4,a,b,7,8\}\)
\(\displaystyle D=\{5,6,c,d,7,8\}\)

 

[fabaho]

Re: Discrete Math

Thanks I appreciate your help.

 

[Deleted member 4993]

DUPLICATE POST:

http://www.scienceforums.net/topic/52908-discrete-math/

 

[fabaho]

So?

 

[Deleted member 4993]

So?

If another student is looking for same help - s/he can also refer to the answer given in that board.

Why do you want to erase your post?