1) Given set A and {$} where {$} represents set with only one element. Prove there is bijection between A x {$} and A.
2) Given sets A, B. Prove A x B is equivalent to B x A using bijection.
3) Given sets A, B, C. Prove (A x B) x C is equvilaent to A x (B x C) using a bijection.
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