Sum
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Number of terms
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Step by step
Evaluate a sigma summation of an expression in k from a lower to an upper index — the terms are expanded and added for you.
Step by step
Enter the term expression in k and the index range.
Use k as the index variable, for example k², 2k+1 or 1/k. Press the up arrow to raise an exponent; functions like sqrt also work.
Enter the lower and upper values of k. The calculator adds one term for each whole value from the lower to the upper bound.
The total appears with the terms expanded in the steps so you can check the series.