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OpenStudy (anonymous):
What is the sum of the arithmetic sequence 6, 14, 22 …, if there are 26 terms
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OpenStudy (anonymous):
find the common difference first\[d = a_n - a_{n-1}\]and then use the sum formula for arithmetic progression\[S_n = \frac{n}{2}\left( 2a_{1} + \left( n - 1 \right)d \right)\]
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