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Rajan@2021
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Find the indicated terms in each of the following arithmetic progression: 1,6,11,16,…,a20 ,

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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:
1,6,11,16,…,a20

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1 Answer

  1. From the question,
    The first term a=1
    Then, difference d=61=5
    116=51611=5
    Therefore, common difference d=5
    From the formula,
    an=a+(n1)d
    So,a20=a+(201)d=1+(201)5=1+(19)5=1+95=96
    Therefore, a20=96

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