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?
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
That was right thanks
