One.
Only one. She stands with the bulb and the world revolves around her.
If you know the number, you don't know where the socket is.
None they all stand around complementing it then get mad when it wont screw. Heard from my friend
3. One to screw it in, the next to claim credit and the third to be a bot that reposts.
Circuit training.
Twelve. Three to Physically Change the Bulb, Three to Talk About How Complicated it Was and Six to Call themselves Electricians.