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counting and probability intermediate

Problem

A particular committee needs one -grader and three -graders. If there are four -graders and six -graders applying to the committee, in how many ways can the committee be filled?
Solution
There are ways to choose the 7th grader for the committee from the four 7th graders and ways to choose the three 8th graders for the committee from the six 8th graders, for a total of ways the committee can be filled.
Final answer
80