This may seem a stupid question, but how does a left-handed string player play in an orchestra?

They are generally seated at the other end of the line. if there are more than one, then they sit together.

Just like at the dinner table, we sit on the end.

@MissPoovey You’re a string player?

I play the cello, and you play it just the same way. It may be harder, however. I don’t think they make left handed cellos.

No, just left handed. From the age where I was the only one in school because the teachers wouldn’t allow anyone to be left handed. If my mom hadn’t hated the teacher so much I would be right handed and confused. Back then there were no music teachers that would teach a left handed person. We lefties were to learn to be right handed or not learn to play an instrument.
But I know the answer from my family, there are now lefties playing now.

@troubleinharlem yes they make left handed cellos. they just reverse the strings