Steve is a fan of the music of Paul Simon and Art Garfunkel. In his collection of 25 compact discs, he has the following:5 on which both Simon and Garfunkel sing7 on which Simon sings8 on which Garfunkel sings15 on which neither Simon nor Garfunkel singsa) How many of his compact discs feature only Paul Simon? b) How many of his compact discs feature only Art Garfunkel? c) How many feature at least one of these two artists?
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