SOLUTION: 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 ?

Algebra ->  Probability-and-statistics -> SOLUTION: 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 ?      Log On


   

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 ?
Answer by robertb(5830) About Me  (Show Source):
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***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.