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NDA 2011

Exam: NDA
Year: 2011
Subject: Mathematics
Chapter: Permutation and Combination

NDA 2011 · Mathematics · Permutation and Combination

How many diagonals will be there in an n -sided regular polygon?

How many diagonals will be there in an

n

-sided regular polygon?

Options

A $\frac{n(n-1)}{2}$
B $\frac{n(n-3)}{2}$
C $n^2-n$
D $\frac{n(n+1)}{2}$

Correct answer

B. $\frac{n(n-3)}{2}$

Step-by-step solution

The correct answer is option B

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