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Rajan@2021
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Which term of the AP 5,15,25,….will be 130 more than its 31st term?

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An important and exam oriented question from arithmetic progression chapter as it is already asked in previous year paper of 2006 in which we are to find which term of the AP 5,15,25,….will be 130 more than its 31st term?

Book – RS AGGARWAL, class 10, Arithmetic Progression, chapter 5A, question no 15

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1 Answer

  1. We have, a=5 and d=10

    an=a+(n1)d

    a31=a+30d=5+30×10=305

    Let nth term of the given A.P. be 130 more than its 31st term.

    Then, an=130+a31

    a+(n1)d=130+305

    5+10(n1)=435

    10(n1)=430

    n1=43

    n=44

    Hence, 44th term of the given A.P. is 130 more than its 31st term.

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