There is a figure composed of a cube. The first level is one, the second level is three, the third level is five, and the fourth level is seven. How many N levels are there in the fifth level

There is a figure composed of a cube. The first level is one, the second level is three, the third level is five, and the fourth level is seven. How many N levels are there in the fifth level

The first layer is one, and each layer has two more,
So the fifth layer is: 1 + 2 × 4 = 9
The nth layer is: 1 + 2 (n-1) = 2N-1 (number)

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