Mutually Exclusive Events
How to solve mutually exclusive events problems: formula, example, and its solution.
Mutually exclusive events are the events
that cannot happen together.
P(A and B) = 0.
So if A and B are mutually exclusive events,
then P(A or B) = P(A) + P(B).
There's no triangle and white card.
So selecting a triangle card
and selecting an white card
are mutually exclusive events.
So P(A and B) = 0.
P(A or B) = P(A) + P(B) = 4/15 + 7/15.