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Rajan@2021
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Which term of the AP 21, 18, 15,….is -81?

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An important question from arithmetic progression chapter in which we have been asked to find which term of the AP 21, 18, 15,….is -81?

Book RS Aggarwal, Class 10, chapter 5A, question no 13

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1 Answer

  1. Given AP is 21,18,15,....
    First term =a=21
    Common difference =d=1821=3
    Last term =l=0
    l=a+(n1)d
    0=21+(n1)(3)
    0=213n+3
    243n=0
    or n=8
    Answer: Zero is the 8th term.

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