All chariot racers are musicians. Some chariot racers are soldiers. Therefore, some musicians are soldiers. Valid or Invalid?
Valid. Your second premise
Valid. Your second premise tells you that some chariot racer is a soldier. Let's call him "Alfred". So Alfred is a chariot racer and Alfred is a soldier. So Alfred is a chariot racer. This last fact, combined with the first premise, tells us that Alfred is a musician. But Alfred is also a soldier. So Alfred is both a musician and a soldier. Hence, someone is both a musician and a soldier. Which is your conclusion.
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