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36

Factorise 162 =2x3x3x3x3

Now make the (2x3x3) x( 3 )x(3)

To make perfect cube

Multiple it with 2x3 x2x3

So y=36

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In N-cube graph we have no. of vertices = $2^N$ and no. of edges = $N*2^{N-1}$Can anyone explain how we get this no. of edges?