Question

A event which has only ...X... sample point of a sample space, is called simple event. Here, X refers to

• A. two
• B. three
• C. one
• D. zero

Answer 1

Answer: (C)

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 events corresponding to this sample space. These are $E_1=\{HH\},E_2=\{HT\},E_3=\{TH\}$ and $E_4=\{TT\}$.