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Rajan@2021
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Guru

Find the indicated terms in each of the following arithmetic progression: -4,-7, -10, -13….a25, an.

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an important question from the book -ML aggarwal( avichal publication)class 10th , chapter9, arithmetic progression……..
This type of question has been asked in paper. so please solve it in detail.Find the indicated terms in each of the following arithmetic progression: -4,-7, -10, -13….a25, an.

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1 Answer

  1. From the question,
    The first term a=4
     Then, difference d=−7(−4)=−7+4=−310(−7)=−10+7=−313(−10)=−13+10=−3
    Therefore, common difference d=3
    From the formula, an=a+(n1)d
    S0,a25=a+(251)d=−4+(251)(−3)=−4+(24)3=−472=−76
    Therefore, a25=76
    Now, an=a+(n1)d
    an=−4+(n1)3=−43n+3=−13n

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