51-56 Partial Sum of an Arithmetic Sequence Find the partial sum of the arithmetic sequence that satisfies the given conditions.
The partial sum of the arithmetic sequence that have , and .
The partial sum of an arithmetic sequence is given as,
Here, is the partial sum of terms, is the number of terms, is the first term of the sequence and is the common difference of the sequence.
Substitute for , for , and for in equation , to calculate
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