Sandra is writing an article and taking pictures for the school newspaper. She chooses three pictures from the set of 20 pictures she took to go with her article. a. How many different sets of pictures can she choose?   b. After she chooses her pictures, she has to decide where to put the pictures in the layout of the article. There are five locations on the page where pictures can go. How many ways can the three pictures be arranged on the page?

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