5.1, due on October 19

Difficult:
I had a hard time understanding how part iii of Proposition 5.1.9 holds. How is it that P(EUF) = P(E) + P(F) - P(E^F)? Where does that third term come from?

Reflective:
I think it is interesting that permutations and combinations were taught in chapter 1 instead of this chapter. It seems like they fit the material here better.

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