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ovoleg
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Homework Statement
If A is a subs4et of B and B is a subset of C, then A is a subset of C. But if A = {3}, B={{3},5}, and C = {B, 17}, then A is contained in B and B is contained in C, but A is not contained in C. The set C has exactly two members, and it is easy to see that neither of these members is a set of A
Homework Equations
Why? if B = {{3}, 5} then shouldn't C be = {{3}, 5, 17} ??
The Attempt at a Solution
I don't see how A is not contained in C
Can someone clarify?
Thanks!