D
dextrous
An empty bus(apart from the driver of course) drives out of the depot, at the first stop two people get on,
at the second stop five people get on one gets off
at the third stop 3 get off and four get on
at the fifth stop no one gets off 2 get on
at the final sixth stop no one gets on or off
the bus drives back to the depot when examined there is not a single person on board, how?
Don't suppose all the passengers still on board are married, and thus not "single"?
Or indeed, the fact that, there being 9 people on board, there is indeed not a "single" person on board?
