Probability 3 Question 20
20. The probability that an event $A$ happens in one trial of an experiment, is 0.4 . Three independent trials of the experiments are performed. The probability that the event $A$ happens atleast once, is
$(1980,1 M)$
(a) 0.936
(b) 0.784
(c) 0.904
(d) None of these
Objective Questions II
(One or more than one correct option)
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Solution:
- Given that, $P(A)=0.4, P(\bar{A})=0.6$
$P$ (the event $A$ happens at least once)
$=1-P$ (none of the event happens)
$=1-(0.6)(0.6)(0.6)=1-0.216=0.784$
