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In this case they are n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane. Any formula that goes by CnH2n+2 is an alkane. There isn't a formula you can use to find out how many isomers there are for any given class of molecules with a specified number of carbons. You just have to think very systematically when you try to find them all.
A hexagon has six sides and six vertices, or points. The interior angles of the hexagon will add up to 720 degrees. The most common hexagon is the regular hexagon in which all of the sides are the same length. Perhaps the most recognizable hexagon-shaped item in life is a nut.