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**Riddle**: At two meters a pole was erected. How many poles are there at a distance of 400 meters?

It’s a very simple math puzzle. At first you might think the answer is 200, but it’s not. First of all, let’s explain why the answer is not 200.

Suppose we have 2 poles. We can sew a new pole 2 meters after the first pole. So, we used 2 posts for the first 2 meters. We put another pole 2 meters after the 2nd pole. It was 3 poles and 4 meters in total.

If we move forward like this, We have to use 1 pole for every 2 meters. From here, 200 poles are required for 400 meters. Let’s not forget that we used a pole to start.

We need a total of 201 poles.

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