A box contains $1$ red and $3$ identical white balls. Two balls are drawn at random in succession without replacement. Write the sample space for this experiment.
It is given that the box contains $1$ red ball and $3$ identical white balls. Let us denote the red ball with $R$ and a while ball with $W$.
When two balls are drawn at random in succession without replacement, the sample space is given by
$S =\{ RW , WR , WW \}$
On her vacations Veena visits four cities $( A ,\, B ,\, C$ and $D )$ in a random order. What is the probability that she visits $A$ just before $B$ ?
An experiment consists of recording boy-girl composition of families with $2$ children. What is the sample space if we are interested in knowing whether it is a boy or girl in the order of their births ?
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