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?
Question:
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?
Answer:
Let's think step by step.

user
\frac{2}{9}
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?
train