Multiple Choice Questions on The number of diagonal of a lsquo n rsquo sided polygon is given by ........ for CDS Exam Preparation

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Multiple Choice Questions

The number of diagonal of a lsquo n rsquo sided polygon is given by ........

Quantitative Aptitude (CDS) Permutation & Combination
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    The number of diagonal of a ‘n’ sided polygon is given by.

    n(n+3)/2

    Incorrect Answer

     n(n 3)/2

    Correct Answer

     n(n-1)(n+1)/2                        

    Incorrect Answer

    n(n-2)/2

    Incorrect Answer
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    Explanation:

    total no. of lines joining two pointes = nC2
    Hence,
    diagonal= nC2- no. of sides of polygon                                            
    =n(n- 1)/2 – n =  n(n- 3)/2

    By: bhavesh kumar singh
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