Edit: After reading Plato's post, I realize that I made some assumptions about your intended meaning. Please do clarify.
Are there exactly eight pullovers? Are they all different?
Or are there many (how many) different pullovers to choose from?
If so, can a girl buy two of the same type pullover?
Can you clarify this question?
The first girl would have ways to have the pullovers distributed to her. The second girl would have ways to have the pullovers distributed to her. The third girl would have ways and the last girls would have . This would be 28+15+6+1.
Experts please let me know if this is correct.