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Rajan@2021
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Which term of the AP 72, 68, 64, 60,…..is 0?

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A basic and conceptual question from arithmetic progression chapter in which we have been asked to find which term of the AP 72, 68, 64, 60,…..is 0?

Book- RS AGGARWAL, arithmetic progression, chapter 5A,  question no 11

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  1. AP is 72,68,64,60,....
    Let nth term is 0.
    Here,
    First term =a=72
    Common difference =d=6872=4
    an=a+(n1)d
    0=72+(n1)(4)
    72=4(n1)
    n1=18
    n=18+1=19
    Therefore, 0 is the 19th term.

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