The answer is 1:30 or 1/30.
There are 6 possible outcomes from rolling a dice, so you multiply 6 and the amount of times rolled, in this case its 20.
6 x 20 = 120
It says what is the probability of rolling 1 or 2 from the 20 rolls. So you multiply 2 and 20, which gives you 40.
The probability is 40/120, but you must simplify it, by dividing both sides of the fraction by its greatest common factor. The GCF is 40, so it is 1/30
