Probability is always set up as a fraction with favorable outcomes in the numerator (top) and total outcomes in the denominator (bottom). In this case we are being asked about rolling an odd, prime number on a 6-sided die. 1 is not a prime number, and although 2 is a prime number it is not odd, but 3 is an odd prime number. Four is not odd nor is it prime, but 5 is an odd prime number. Six is again neither odd nor prime. Therefore, we have two favorable outcomes. There are six total outcomes of rolling each die, so our probability of rolling an odd, prime number is 2/6, which simplifies by dividing both numbers in the numerator and denominator by 2, to 1/3. Since we are being asked about rolling the die 3 times, and each roll is an independent event since the die has no memory of previous rolls, the probability of rolling an odd, prime number three times in a row is the product of multiplying the probabilities of each roll. Since each roll is the same and therefore has the same probability, the total probability is (1/3)(1/3)(1/3) = 1/27.