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29 November, 02:32

Find the first term of the arithmetic sequence in which t22=1008 and d = - 8

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  1. 29 November, 02:51
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    Tn = nth term

    t22 = 22nd term

    d = common difference

    d = - 8

    n = number of terms

    n = 22

    .

    tn = t1 + (n - 1) d

    t22 = t1 + (n - 1) d

    1008 = t1 + (22 - 1) - 8

    1008 = t1 + (21) - 8

    1008 = t1 + 168

    1008 - 168 = t1

    840 = t1
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