Let `T_n` denote the number of triangles, which can be formed using the vertices of a regular polygon of `n` sides. It `T_(n+1)-T_n=21` ,then `n` equals a.`5` b. `7` c. `6` d. `4`

Let T_n donote the number of traingles which can be formed using the vertices of a regular polygon of n sides. If T_(n+1) -T_n=21 then n equals

Choose the most appropriate options. Let T _(n) denote the number of triangles which can be formed using the vertices of an regular polygon of n sides. If T _(n +1) - T _(n) = 21 then n equals

Let T_n be the number of all possible triangles formed by joining vertices of an n-sided regular polygon. If T_(n+1)-T_n=""10 , then the value of n is (1) 5 (2) 10 (3) 8 (4) 7

The number of triangles that can be formed with 10 points as vertices n of them being collinear,is 110. Then n is a.3 b.4 c.5 d.6

Let T_(n) be the number of all possible triangles formed by joining vertices of an n-sided regular polygon, If T(n+1)-T_(n)=10 , then value of n is

Let Q_(n) be the number of possible quadrilaterals formed by joining vertices of an n sided regular polygon. If Q_(n+1)-Q_(n)=20 , then value of n is:

The number of triangles that can be formed form a regular polygon of 2n + 1 sides such that the centre of the polygon lies inside the triangle is