p(a or b) accuracy

[raybies]

P(A or B)=P(A)+P(B).

Is this an accurate way to find the probability? Why or why not?

 

[Deleted member 4993]

P(A or B)=P(A)+P(B).

Is this an accurate way to find the probability? Why or why not?

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[pka]

P(A or B)=P(A)+P(B).
Is this an accurate way to find the probability? Why or why not?

NO! it is the same a counting: \(\mathcal{P}(A \cup B) = \mathcal{P}(A) + \mathcal{P}(B) - \mathcal{P}(A \cap B)\)