10th Class Mathematics Solved Paper - Mathematics-2016 Outside Delhi Set-I

  • question_answer For what value of k will \[k+9,2k-1\] and \[2k+7\] are the consecutive terms of an A. P.?

    Answer:

    We have, \[k+9,\text{ }2k-1\] and \[2k+7\] as consecutive terms of an A.P
    Then, \[2\,(2k-1)=k+9+2k+7\] [if a, b and c are in A.P. then \[2b=a+c\]]
    \[4k-2=3k+16\]
            \[k=18\]


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