8,9 In a plane, there are 11 gears arranged such that the first is engaged with the second, the second with the third, ..., and the eleventh with the first.

Can they rotate?
Adjacent gears must rotate in opposite directions. Therefore, gears numbered 1 and 11 should rotate in the same direction (all wheels with odd numbers rotate in one direction, and those with even numbers rotate in the opposite direction). On the other hand, gears numbered 1 and 11 are adjacent, so they should rotate in opposite directions.

## Answer

They cannot.