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  4. If A and B are mutually exclusive events , given that P(A) = (3/5) , P(B) = (1/5), then P(A or B) is

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Q. If A and B are mutually exclusive events , given that $P(A) = \frac{3}{5} , P(B) = \frac{1}{5}$, then P(A or B) is

KCETKCET 2018Probability - Part 2

Solution:

Given $P(A) = \frac{3}{5}$ and $P(B) =\frac{1}{5}$
P(A or B) = P(A $\cup$ B) = P(A) + P(B) (because A and B are mutually exclusive)
$ = \frac{3}{5} + \frac{1}{5} = \frac{4}{5} = 0.8 $