Question

An experiment succeeds thrice as after it fails. If the experiment is repeated 5 times, what is the probability of having no success at all?
(a) 1/1023
(b) 1/1024
(c) 1/1005
(d) 1/1008​

Answer 1

Answer:

An experiment succeeds as often as it fails.

We need to find the probability of atleast 3 successes in the next 5 trials.

Required probability = P(X=3)+P(X=4)+P(X=5)

(b) is the correct answer..

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