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Rajan@2021
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Which term of the AP 121, 117, 113,…..is it’s first negative term?

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Sir please give me a detailed solution of this question in which we have been given a series of AP 121, 117, 113,…and we have been asked to find its first negative term?

Book – RS Aggarwal, Class 10, Arithmetic Progression, chapter 5A, question no 24

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1 Answer

  1. a=121 and 

    d=117121

      =4

    an=a+(n1)d

    =121+(n1)(4)

    =1214n+4

    =1254n

    We have find the first term of this A.P.

    Therefore an<0

    1254n<0

    124<4n

    n>125/4

    n>31.25

    n=32

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