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[" 19.Let "T(n)" be the number of all po...

[" 19.Let "T_(n)" be the number of all possible triangles formed by "],[" joining vertices of an "n" -sided regular polygon.If "T_(n+1)-22],[T_(n)=10" ,then the value of "n" is: "[JEEMAIN-2013]],[[" (A) "10," (B) "8],[" (C) "7," (D) "5]]

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