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  3. let a and b be finite sets. prove the following: (

Let A and B be finite sets. Prove the following: (a) |A?B|=|A|+|B|?|A?B| (b) |A × B| = |A||B| (c)...

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Advance Math

Let A and B be finite sets. Prove thefollowing:

(a) |A?B|=|A|+|B|?|A?B|

(b) |A × B| = |A||B|

(c) |{f : A ? B}| = |B||A|

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