Let Tn be the number of all possible triangles formed by oining vertices of an n-sided regular polygon. If Tn+1 – Tn = 10, then the value of n is :

Question:

Let $T_{n}$ be the number of all possible triangles formed by joining vertices of an $n$-sided regular polygon. If $\mathrm{T}_{n+1}-\mathrm{T}_{n}=10$, then the value of $n$ is:

  1. 7

  2. 5

  3. 10

  4. 8

Correct Option: 2

JEE Main Previous Year 1 Question of JEE Main from Mathematics Permutations And Combinations chapter.
JEE Main Previous Year 2013

Solution:

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