The probability of happening an event A in one trial is 0.4. The probability that the event A happens at least once in three independent trials is
Answer & explanation
Correct answer: option 2
Here $P(A) = 0.4 $ and $P(\overline{A})=0.6$
Probability that A does not happen at all = $(0.6)^3$ . Thus required probability =$1 -(0.6)^3 = 0.784.$