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Find the 15th term of the AP -40, -15, 10, 35,…

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A basic question from arithmetic progression in which we have been asked to find the 15th term of the AP -40, -15, 10, 35,…

Book – RS AGGARWAL,

class 10, Arithmetic Progression, chapter 5A,  question no 2(v)

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  1. The 15th term of the AP 40,15,10,35,...
    Given: AP is 40,15,10,35,....
    Here, first term =a=40
    Common difference =d=15(40)=15+40=25
    nth term is given by,
    an=a+(n1)d

    n=15

    a15=40+(151)25
    =310.

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