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Rajan@2021
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Find the 20th term of the AP 9,13,17,21,……

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A basic and conceptual question from arithmetic progression chapter in which we have been asked to find the 20th term of the series 9,13,17,21,......

Book – RS Aggarwal, Arithmetic Progression, chapter 5A,  question no 2(i)

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1 Answer

  1. Given AP is 9,13,17,21,....
    Here, first term =a=9
    Common difference=d=139=4
    nth term is given by,
    an=a+(n1)d
    For 20th term put n=20.
    a20=9+(201)4
    =85.

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