there are two refferies in a basketball game
anywhere from 14-17 players
there is 4 in an NBA game and 4 in a NCAA basketball game or college basketball.
There is really no answer for this. Since players are constanty joining the NCAA every year. It changes every year. my guess would be close to 500-ish. Since there are many teams.
It varies for each team, but most have around 13-15
If someone is in basketball, they play the game.