Question-3 The probability that an event A happens in one trial of an experiment is 0.4 . Three independent trials of the experiment are performed. The probability that the event A happens at least once is
A) 0.904
B) 0.936
C) 0.784
D) None
Answer: C) 0.784
Explanation
Here, P(A)=0.4 and P(\overline A)=1-0.4=0.6
Probability that the event A at least once = 1 — P (event a does not
happen in all three trials)
= 0.784