all the other numbers are either prime or even or both, and the probability of this is 1/6. the second dice also has to show 1, so the chance that they both show 1 is 1/6 x 1/6 = 1/36 = 0.03.
1.5. if i roll two dice, what is the probability that both of them are both prime and even?
the first dice has to show 2, as it is both even and prime, and the probability of this is 1/6. the second dice also has to show 2, so the chance that they both show 2 is 1/6 x 1/6 = 1/36 = 0.03.
next, take a look at this puzzle 