which term of an AP:7.3,6.9,6.5,6.1… is the first negative term​

Question

which term of an AP:7.3,6.9,6.5,6.1… is the first negative term​

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Serenity 10 months 2021-07-07T15:04:32+00:00 1 Answers 0 views 0

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    2021-07-07T15:06:31+00:00

    A.P : 7.3,6.9,6.5,6.1…
    a=7.3,d=6.9-7.3=-0.4

    First negative term =an
    We know 0.4*18=7.2
    an =a+(n-1)d
    Taking n-1 =18
    an =0.1
    Now if we take n-1=19
    an = 7.3-7.6=-0.3
    Therefore n-1=19 term is first negative. That means n=19+1=20

    Hence 20th term is first negative term

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