SATHEE: Probability 3 Question 20

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

(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)

$= 1 - (0.6) (0.6) (0.6) = 1 - 0.216 = 0.784$

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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

Objective Questions II

Solution:

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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