Fetching details from the dictionary...
three people
三人で力を合わせて荷物を運んだ。
The three of us worked together to carry the luggage.
会議室には三人しかいなかった。
There were only three people in the meeting room.
三人の候補者から一人を選ぶことになった。
It was decided to choose one person from three candidates.