There are different formulas for calculating the two types of compound events: Say A and B are two events, then for mutually exclusive events: P(A or B) = P (A) + P(B). For mutually inclusive events, P (A or B) = P(A) + P(B) - P(A and B).
There are 22 signs.
Because:
5,280 divided by 240 equals 22
If I'm not mistaken I believe the answer is 54
