Because if I had two apples and you gave me two oranges, I would have 4 fruits. If I asked you how many pair groups of apples you had, you'd say 2. If I asked y

Because if I had two apples and you gave me two oranges, I would have 4 fruits. If I asked you how many pair groups of apples you had, you'd say 2. If I asked you how many groups of no apples you had, you are free to choose any number, depending on how imaginative you were.