Pnc Diagonals of a polygon
Hi
I was doing pnc and the question was to find no. of diagonals of a polygon with n sides. I thought that since we take a vertex, and form a line with any other vertex except the 2 vertices adjacent to the first one, it should be (n-2)C2
But my sir said it would be nC2-n, which I agree with and know my method was wrong but dont how it was wrong
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