Math Major (M), Science Major (S), China (C), England (E), Japan
(J), Korean (K).
(a) China Math Major students who also learn Science course is
(C∩M)∩S.
Show that for a student not belonging to Category in (a), if the
student is a Math Major, then at least one of the following is
true:
(i) belongs to England, Japan, or Korean.
(ii) did not learn the Science Major.