if a randomly selected positive single digit multiple of 3 is multiplied by a randomly selected prime number less than 20 , what is the probability w that this product will be a multiple of 45 ?
n0 = 3.0
n1 = 20.0
n2 = 45.0
t0 = n1 + 4.0
answer = 1.0 / t0
print(answer)