Answer
The sample space is
$S=${$1H;2H;3H;4H;5H;6H;1T;2T;3T;4T;5T;6T$}
Work Step by Step
During the coin toss experiments the letter $H$ means heads and the letter $T$ means tails.
The sample space is a set that consists of all the possible results of the experiment.
Here, during the dice roll, all 6 numbers on the dice is possible. During the coin toss, both heads and tails are possible outcomes. Therefore there will be $6\times2=12$ possible outcomes.
The sample space is
$S=${$1H;2H;3H;4H;5H;6H;1T;2T;3T;4T;5T;6T$}
(the number represents the dice roll, the letter represents the coin toss).
