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[," 20.Let "T(n)" be the number of all p...

[," 20.Let "T_(n)" be the number of all possible triangles formed by "],[" ing the "," joining vertices of an "n" -sided regular polygon.If "T_(n+1)-T_(n)],[" ing the ",=10," then the value of "n" is: "],[[" (a) "7," (b) "5," (c) "10," (d) "8]]

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