Part 1 I have to use symbols in my anwser

Question

Suppose B is proper subset of C
If n(c)=8, what is the maxium number of elements in n (B)
What is the least possible numbers of Elements in B?

Part 2

Suppose C is a subset of D and D is a subset of C
If n (C)=5, find n (D)
What is other relationship exists between sets C and D?

Answer 1

Sabrina has asked these questions before, and the links are:
http://www.jiskha.com/display.cgi?id=1249745879
http://www.jiskha.com/display.cgi?id=1249748610