Ellen must take 4 courses from a list of 3 business courses and 7 science courses

Ellen must take 4 courses from a list of 3 business courses and 7 science courses.?
A. In how many ways can she select the four courses if she must choose 2 business courses and 2 science courses? B. In how many different ways can she select the four courses if she must choose at least one business course?
Higher Education (University +) - 1 Answers

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Data management combinations questions!!! I love them. A. 3C2 x 7C2 = 63 B. 11C4 - 7C4 = 295 all selections minus "all four course from science" will give you "at least one business course" I hope it helps! If it's wrong, I don't know why I'm doing so well in that class.