the sum of n terms of AP 21,28,35,42,-..is 175 find n

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the sum of n terms of AP 21,28,35,42,……is 175 find n

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Savannah 3 months 2021-11-06T13:12:38+00:00 1 Answer 0 views 0

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    2021-11-06T13:14:34+00:00

    Sum of n terms=

    a=21

    d=7

    n=175

    Sn=

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