You can see by the image how did I get the answer
Answer:
0
Step-by-step explanation:
Cancel out x-y to x^2-Y^2 and you get x+y-x-y which is 0
The correct option is : no mode
<u><em>Explanation</em></u>
The given data set is: 
The <u>mode is the number that is repeated more often</u> than any other number in the data set.
But here we can see that all the numbers in this data set are different. That means <u>they appear only once</u>.
So, there will be 'no mode' in this set.
I have no clue how to solve this myself but i would recommend using photomath for tricky equations because it gives you a step by step tutorial for the problem