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10th Class Mathematics Arithmetic Progressions Question Bank Arithmetic Progressions

  • question_answer
    What is the sum of first 'n' odd numbers starting from 11?

    A)  \[{{n}^{2}}+10n\]           

    B)         \[{{n}^{2}}-10n\]

    C)  \[10n-{{n}^{2}}\]            

    D)         \[{{n}^{2}}\]

    Correct Answer: A

    Solution :

     Odd numbers starting from 11 are 11, 13, 15, 17, 19, .... Sum to 'n' odd numbers, where a = 11, d = 2 is \[p(-1)={{(-1)}^{2}}+3(-1)-2=(-4)\]\[p(-1)=-4\]


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