Question: This is a method for determining the In a dorm room of 15 people, 7 of them knows how to play guitar while 5 of

This is a method for determining the In a dorm room of 15 people, 7 of them knows how to play guitar while 5 of them plays the piano. If 2 people can play both, how many can play the guitar ONLY?number of elements without actually enumerating the elements in a set one by one

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