Noel throws a four-sided dice numbered 1, 3, 5 and 7 and a four-sided dice numbered
-1, -2, -3 and -4 at the same time and multiplies the scores.
The sample space diagram below shows all the possible outcomes.
1 3 5 7
-1 -1 -3 -5 -7
-2 -2 -6
-10 -14
-3 -3 -9 -15 -21
-4 -4 -12 -20 -28
Find the probability that Noel gets a number equal to -2.
