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If $t_n$ denotes the number of triangles formed with n points in a plane no three of which are collinear and if $t_{n+1}-t_n=36,$ then $n=$

\[(a)\;7 \quad (b)\;8 \quad (c)\;9 \quad (d)\;10 \]
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(c) 9
answered Nov 7, 2013 by pady_1

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