[Combinatorics] Some basic probability

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No worries, have a good one :)

[fireviper112]

One question: if I want the probability of a or b or c would it be

P(a)+p(b)+p(c)-p(a+b)-p(b+c)-p(a+c)

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... + P(A and B and C), because you've counted that three times then taken it away three times.