Precalculus

Write the sum using sigma notation.
-3/8 + 4/7 - 5/6 + 6/5 - 7/4+ 8/3

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  1. Rob/Jeff -- please use the same name for your posts.

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    Ms. Sue
  2. I assume you know how to write sigma: ∑

    Note that the numerators go from 3 to 8, alternating signs, and the denominators count down from 8 to 3:

    8
    ∑ (-1)^k * k/(11-k)
    k=3

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