Question
Let $T_{n}$ denote the number of triangles which can be formed using the vertices of a regular polygon of $n$ sides. If $T_{n+1},=T_{n}=21$, then $n$ equals :$\mid 20021$(A) 5(B) 7(C) 6(D) 4
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It should be $T_{n+1}=T_{n}=21$. Show more…
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