Starting with 2 sets A and B of respective cardinalities a and b, use all operations on sets that you have learnt:
1) to construct sets whose cardinalities are the following
2) to construct word-problems whose solutions require counting the numbers of the sets you first constructed
a) (b+a)(b-a)
b) b^{a+b}
Please, help.

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I don't know how to start.

@mathmate

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