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Two distinct integers, x and y, are randomly chosen from the set {1,2,3,4,5,6,7,8,9,10}. What is the probability that xy-x-y is even?

 Jul 29, 2018
 #1
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Hint: both have to be even.

 

First, we do 5 choose 2, which gives us 10. Then, we find the total number of possibilities, which is 10 choose 2 which equals 45. Thus the answer is 10/45=2/9

 Jul 29, 2018
 #2
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That was right thanks

Guest Jul 29, 2018

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