Use a combinatorial proof to show the identity holds where n is a natural number.

Part 2: (1) Use a combinatorial proof to show the identity holds where n is a natural number. (2) In the space below, sketch all (not necessarily connected) graphs with exactly 4 vertices. Do not include graphs that are isomorphic to one another (i.e. if two graphs can be shown to look identical by simply stretching edges and/or moving around vertices, then include only one of them)

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