A physicist, a biologist, and a mathematician are sitting on a bench across from a house. They watch as two people go into the house, and then a little later, three people walk out.
The physicist says, "The initial measurement was incorrect."
The biologist says, "They must have reproduced."
And the mathematician says, "If exactly one person enters that house, it will be empty."
Is it because there’s -1 person in there??
(2-3=-1)
I dare say you got that right. (At least that's how I was figuring it, too.)
Sequence...(2,1), (1,0).....
@Gatovicolo ??
@WilliamFleming If you put two in, you get one out. So, if you put one in, you get zero out. Arithmetic series. 1, 0, -1, -2.....