Ten balls numbered from to are placed into a bag. Some are grey and some are white.
The ball numbered is grey.
The balls numbered , , , , , , , , and are white.
A ball is selected at random.
Let be the event that the selected ball is white, and let be the probability of .
Let not be the event that the selected ball is not white, and let not be the probability of not .

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.