Jamie wants to make a playlist with 8 songs on her iPod. She has 50 songs to choose from, including 15 songs from Maroon 5. Janine's iPod won't allow any song to appear more than once in a playlist. Janine was able to download all 91 songs from Maroon 5. She has finally decided that she wants 20 songs in her playlist and half of Maroon 5. How many different sets are possible if the order did not matter?