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.

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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

$S =\{ RW , WR , WW \}$

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