At the supermarket, there are four types of apples available to buy

a.If exactly two are placed in a bag, how many different ways are there to pack a bag of apples?(9 points)

-If any formulas are used, describe them and why they are the correct ones to use.

-List all the ways explicitly using appropriate symbols for each of the apples.

I do not understand what this question is asking.

***Need help with question and to have it broken down as simply as possible so that I can understand. thank you for your help.