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into the unknownnnnn
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the sum of all the probabilities of all outcomes of an experiment
must equal one

complement of A
pr(A’)=1-pr(A)

addition rule
Pr(A u B)=Pr(A)+Pr(B)-Pr(A n B)

conditional
Pr(A\B)=Pr(A n B)/Pr(B)

independancy
Pr(A n B) = Pr(A) x Pr(B)

angle between a line and the positive x axis is
given by m=tan(theta)