SAT Math Multiple Choice Practice Question 394: Answer and Explanation
20. A bag contains six chips, numbered 1 through 6. If two chips are chosen at random without replacement and the values on those two chips are multiplied, what is the probability that this product will be greater than 20?
Correct Answer: C
C Find all the possible products of the values on two chips: ; ; ; ; ; ; ; ; ; ; ; ; ; ; . There are 15 different combinations of chips. Of these, only the last 2 yield products that are greater than 20. So the probability is 2/15.