Question

this question http://trickiestofall.blogspot.com/2011/07/people-combinations-room.html

Answer 1

PEOPLE COMBINATIONS ROOM
You have an empty room, and a group of people waiting outside the room. At each step, you may either get one person into the room, or get one out. Can you make subsequent steps, so that every possible combination of people is achieved exactly once?

Answer 2

u just copied the question