Editors review story ideas and decide what material will appeal most to readers. Editors evaluate submissions from writers to decide what to publish. They also typically allocate space for the text, photos, and illustrations that make up a story. A local newspaper is planning a 7-part series of articles on gun control. The editor has received 15 submissions from his writers. He must decide which articles to publish and the sequence in which to publish them. How many different options are there for the editor to consider?