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given the arithmetic sequence 71,65,59 ... if a(n) is -43 what is the value of n

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    a = 71, d = -6
    term(n) = a + (n-1)d
    -43 = 71 + (n-1)(-6)
    -43 = 71 - 6n + 6
    6n = 120
    n = 20

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