0 .2.·71. Cotl!iid.:t lhe JoUO\' ing p:tir'S of ~· ~. 28. 29. ;10. 31. 3 of JO. I. A<..JC: BL'D. 2. A. l': Du D. 3. t\>. C;fh l). 4 . ⢠~u .c:n ..... o. Whert ~B.C :md D arc four s.>ls such Utal. 1\ _,B- ill = C 10 . Which or tbcsc pou·s of se ~ nre disjoin I in. en ~. a. l nnd 2. b. 2 and -'. c. I mnl 4. d. 3 â¢ud 4. ln which one of tho follow ~ng cases. give-n.
