Question

One die of red colour, one of white colour and one of blue colour are placed in a bag. One die is selected at random and rolled , its colour and the number on its uppermost face is noted. The number of elements in the sample space is

Answer 1

$1,2,3,4,5$ and $6$ are the possible outcomes when the die is thrown.
Lets assume die of red colour be $R$, die of white colour be $W$, die of blue colour be $B$.
So, the total number of elements in the sample space $=6\times 3=18$
The sample space of the event is
$S=\left\{\right(R,1),(R,2),(R,3),(R,4),(R,5),(R,6),(W,1),(W,2)(W,3),(W,4),(W,5),(W,6),(B,1),(B,2),(B,3),(B,4),(B,5),(B,6)\}$