Describe the sample space for the indicated experiment: A coin is tossed four times.

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When a coin is tossed once, there are two possible outcomes: head $(H)$ and tail $(T)$.

When a coin is tossed four times, the total number of possible outcomes is $2^{4}=16$

Thus, when a coin is tossed four times, the sample space is given by :

$S =\{ HHHH , \,HHHT , \,HHTH $,  $HHTT , \,HTHH , \,HTHT $, $ HTTH , \,HTTT ,$  $THHH,\, THHT, \,THTH, $  $T H T T ,\,  T T H H ,  \,T T H T ,\,  T T T H ,  \,T T T T \}$

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