Question 1061412
<pre><b>
A = 1,2,4,5
B = 2,5,3,6
C = 4,5,6,7
U-A-B-C = 8

{{{drawing(300,300,-4,4,-5,4,
rectangle(-4,-3.5,4,4),
circle(0,-.5,2),
locate(-2.1,2,1),
locate(-3.3,-2,8),
locate(0,-2.7,C),
locate(-.25,-1,7),
locate(.8,.4,6), 
circle(sqrt(2),sqrt(2),2), 
locate(-3.5,2.5,A),
circle(-sqrt(2),sqrt(2),2),
locate(3.5,2.5,B),
locate(-1.3,.5,4),
locate(-.1,2.5,2),
locate(2,2,3),
locate(-.1,1.1,5) )}}}

Rules: U means take them all on the left or right of U
       n means take only what's in common to the left and right of n
       - means take out anything from the set on the left of -
         that's on the right of -.  Don't use any of the ones on
         the right of -.
       ' Don't use any of the set before the ', but use all the others
         in the whole universal set instead.  

a. (A u B)' U C'

(1245 u 2356)' U 4567'
   123456'     U 1238
      78       U 1238
            12378

b. (A- B)' U C

(1245 - 2356)' U 4567
       14'     U 4567
    235678     U 4567
           2345678   


c. A U B'

1245 U 2356'
1245 U 1478
  124578

d. A U ( B n C )

1245 U   56
   12456   

e. A n B n C' 

1245 n 2356 n 4567'
1245 n 2356 n 1238
       2

Edwin</pre>