Question

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

• A. 0.8
• B. 0.6
• C. 0.4
• D. 0.2

Answer 1

Answer: (A)

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)
$=\frac{3}{5}+\frac{1}{5}=\frac{4}{5}=0.8$