Because I don't know of a second person who invented the bike, I don't like either one. Simply: He invented the bike . You could say that someone was the first to climb that mountain or someone was the first person who climbed the mountain .
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AnonymousIs the second OK?No.
AnonymousThe first one says the second sentence in the original post is grammatically correct, the second one says it isn't.No. The first answer implies that both are wrong, and the second says explicitly that the second one is wrong. It's just that what makes them wrong is the logic, not the grammar.