Out of the box thinking.

If A is 15cm away form a wall, and moves by dividends of 2, etc it would move 7cm, then 3.5, then 1.75, then 0.875, etc. Will it ever reach the wall? Before you answer "no" think about it.

>>13
I was following >>1's usage of the word. If you have 15cm, a dividend is when you move to 7.5cm. If you have 7.5cm, a dividend is when you move to 3.75cm. I don't know what else to call it.