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Math Help - Reforestation (arithmetic progression)

  1. #1
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    Reforestation (arithmetic progression)

    This is a rather simple A.P. problem, but I couldn't solve it anyway.


    In a reforestation project, seedings will be planted in straight lines. The first line will have 2 seedings, the second will have 4 seedings, the third, 6, and so on.

    The 992nd seeding will be located in which line?


    Any help?
    Thanks.
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  2. #2
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    Quote Originally Posted by nvwxgn View Post
    This is a rather simple A.P. problem, but I couldn't solve it anyway.


    In a reforestation project, seedings will be planted in straight lines. The first line will have 2 seedings, the second will have 4 seedings, the third, 6, and so on.

    The 992nd seeding will be located in which line?


    Any help?
    Thanks.
    Use the sum of an arithmetic sequence and set equal to 992.

    S_n = \frac{n}{2}(2a+(n-1)d)

    a and d are easy to find from the data given
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  3. #3
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    Figured it out, it's 31.

    Thanks
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