Let \( T_{n} \) be the number of all possible triangles formed by j...

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Let \( T_{n} \) be the number of all possible triangles formed by joining vertices of an \( n \)-sided regular polygon. If \( \mathrm{T}_{\mathrm{n}+1}-\mathrm{T}_{\mathrm{n}}=10 \), then the value of \( \mathrm{n} \) is
\( \mathrm{P} \)
(1) 5
(2) 10
(3) 8
(4) 7
[JEE (Main) 2013]
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