Problems on Sets

[champaksworldcreate]

1. There are 3 students A, B & C knowing the following languages. A knows {C, C++, Java}, B knows {C++, Java , Python} and C knows {Java, Python , C, ,Pascal)
   Find the following
   A. Find subjects known to all three,
   B. Find subject known to A and not to B
   C. Find a list of all available subjects
   D. Find a language known to only known to one student
   E. Find the list of all students who know Python