Question 363476
***if j is chosen at random from the set { 4,5,6 }and k is chosen at random from the set { 10,11,12 }. what is the probability that the product of j and k is divisible by 5 ?***
The answer is 5/9.  Just form the "multiplication table" for j and k.  The possible products are 40,50,60,44,55,66,48,60,72.  Out of the 9 products, 5 are divisible by 5.  Hence the answer.