Counting subsets of Finite sets: A student can choose a computer project from one of three lists. The three lists contain 23, 15 and 19 possible projects, respectfully. No project is on more than one list. How many possible projects are there to choose from?

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By the sum rule, there are $23+15+19=57$ ways to choose a project.

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Question ID: mtid-5-stid-8-sqid-730-qpid-615