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determine the 100th term of the arithmetic sequence with t7=465 and t13=219

  • math -

    t7=465 ---> a+6d=465
    t13=219 --> a+12d=219
    subtract:
    6d = --246
    d = -41
    in 1st equation: a+6(-41) = 465
    a = 711

    term(100) = a+99d = ......

    you finish it

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