An experiment whose outcomes has to be among a set of events that are completely known is a

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sample space

elementary event

random experiment

none of these

answer is C.

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Detailed Solution

Given, an experiment whose outcomes has to be among a set of events that are completely known but cant find outcome.
For an event A , probability of an event P(A) is

P (A) = \frac{Number of favorable outcomes}{Total number of outco mes}

In random experiments, the exact outcome is not known to us.
Therefore, an experiment whose outcomes have to be among a set of events that are completely known but whose exact outcomes are unknown is a random experiment.
Hence, option 3 is the correct answer.

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