Set Theory
posted by Matrix School 2 .
Given the sets A=[a,b], B=[a,b,c], C=[b,c,d]
Prove that if A is a subset of B and
B is a subset of C
then A is a subset of C

You may find some help here on Sets:
http://www.google.com/search?q=Set+Theory+Tutorial&ie=utf8&oe=utf8&aq=t&rls=org.mozilla:enUS:official&client=firefoxa
Sra