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14 October, 06:45

213, 209, 205,

Find the 30th term

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  1. 14 October, 09:53
    0
    a (30) = 97

    Step-by-step explanation:

    Notice how each new term is equal to the previous term, less 4. So this is a decreasing arithmetic sequence with common difference - 4 and first term 213:

    The general a (n) = a (1) - 4 (n - 1) becomes

    a (30) = 213 - 4 (30 - 1), or

    a (30) = 97
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