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So it is not hard just use the exclusive or definitionSo the answer….
i think it's asking for either violin or clarinet. That doesnt include people taht do bothnah it 23/28, its either one of them so jus add them all together leaving the people that do neither out which is 5
sameAs has been said above, I also got 16/28 (excluding 5 who don't play either instrument and 7 who play both). The question asks for EITHER, and I would assume as the previous part was BOTH, you wouldn't include the 7 who play both.