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  1. 1.

    sum_{k=1}^{n} (2k-1)^3 equals:

  2. 2.

    sum_{k=1}^{n} k/(k+1)! equals:

  3. 3.

    Sum to infinity: 1 + 3x + 5x^2 + 7x^3 + ... for |x| < 1 equals:

  4. 4.

    2^2 + 4^2 + 6^2 + ... + (2n)^2 equals:

  5. 5.

    If S_1 = sum(k), S_2 = sum(k^2), S_3 = sum(k^3), then S_3/S_1 equals:

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