class 11 maths | chapter 14 | Probability | exercise 14.1 | Introduction | NCERT
We have studied about random experiment and sample space associated with an
experiment. The sample space serves as an universal set for all questions concerned
with the experiment.
Consider the experiment of tossing a coin two times. An associated sample space
is S = {HH, HT, TH, TT}.
Now suppose that we are interested in those outcomes which correspond to the
occurrence of exactly one head. We find that HT and TH are the only elements of S
corresponding to the occurrence of this happening (event). These two elements form
the set E = { HT, TH}
We know that the set E is a subset of the sample space S . Similarly, we find the
following correspondence between events and subsets of S
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