The first layer has one cube, the second layer adds two cubes on the basis of the previous layer, and the third layer adds three cubes on the basis of the second layer. How many cubes are there in the N layer There is one cube in the first layer, two cubes in the second layer and three cubes in the third layer. How many cubes are there in the N layer

The first layer has one cube, the second layer adds two cubes on the basis of the previous layer, and the third layer adds three cubes on the basis of the second layer. How many cubes are there in the N layer There is one cube in the first layer, two cubes in the second layer and three cubes in the third layer. How many cubes are there in the N layer

(n+1)n/2

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