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The probability of happening an event A ...

The probability of happening an event A in one trial is 0.4. Find the probability that the event A happens at least one in three independent trials.

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The correct Answer is:
`4.0.784`
Here `P(A)=0.4and P(barA)=0.6` Probability that A does not happen at all is `(0.6)^(3).` Thus, required probability is `1-(0.6)^(3)=0.784.`
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