Let T n denote the number of triangles which can be formed using the vertices of a…
Mathematics · JEE Advanced · NTA Exams — Permutations and Combinations
Let Tn denote the number of triangles which can be formed using the vertices of a regular polygon of
n sides. If Tn+1– Tn = 21, then n equals
n sides. If Tn+1– Tn = 21, then n equals
- 5
- 7
- 6
- 4
Answer
(B) 7
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