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Calculus · Series-And-Sums

Sum 3k + 1 for k = 1 to n

\sum_{k=1}^{n} 3 k + 1

Gawo ndi Gawo

  1. \sum_{k=1}^{n} 3 k + 1

    Write the sum out.

  2. 4 + 7 + 10 + 13 + \cdots

    The first few terms.

  3. = \frac{n \left(3 n + 5\right)}{2}

    Closed form (a standard summation formula, provable by induction).

Kusonyeza yankho
\frac{n \left(3 n + 5\right)}{2}