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 ,t h e nn` equals a.`5` b. `7` c. `6` d. `4`

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 denote the number of triangles which can be be formed using the vertices of a regular polygon of n sides. If T_(n+1) - T _n = 21, " then " n =

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

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 form a regular polygon of 2n + 1 sides such that the centre of the polygon lies inside the triangle is

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

Consider a polygon of sides 'n' which satisfies the equation 3*^(n)P_(4)=^(n-1)P_(5) . Q. Number of quadrilaterals thatn can be formed using the vertices of a polygon of sides 'n' if exactly 1 side of the quadrilateral in common with side of the n-gon, is

If \ ^(n+1)C_3=2.\ \ ^n C_2\ t h e n= 3 b. 4 c. 6 d. 5

If m ,n in Na n dm^2-n^2=13 ,t h e n(m+1)(n+1) is equal to a. 42 b. 56 c. 50 d. none of these

If C(n , 12)=C(n ,8),\ t h e n\ C(22 , n) is equal to a. 132 b. 210 c. 252 d. 303