which term of arithmetic progression: 21,18,15,-. is -81​

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which term of arithmetic progression: 21,18,15,….. is -81​

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Maya 2 weeks 2021-09-06T05:32:19+00:00 1 Answer 0 views 0

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    2021-09-06T05:33:24+00:00

    Step-by-step explanation:

    let -81 be n term of ap

    -81=a+(n-1)d

    -81=21+(n-1)(-3)

    -81-21=-3n+3

    -102-3=-3n

    -3n=-105

    3n=105

    n=35

    so -81 is 35th term of this ap

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