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  4. An event which has only ...... sample point of a sample space, is called simple event.

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Q. An event which has only ...... sample point of a sample space, is called simple event.

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Solution:

If an event $E$ has only one sample point of a sample space, then it is called a simple (or elementary) event. In a sample space containing $n$ distinct elements, there are exactly n simple events.
For example, in the experiment of tossing two coins, a sample space is, $S =\{ HH , HT , TH , TT \}$
There are four simple event corresponding to this sample space. There are $E _{1}=\{ HH \}, E _{2}=\{ HT \},E _{3}=\{ TH \}$ and $E _{4}=\{ TT \}$