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(2k +50)
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What is the question asking for?
The question is asking for the sum of the values of 2k + 50 from k=1 to k = 550:
(2.1 +50) + (2 - 2 + 50) + ... + (2.550 + 50)
The series is arithmetic because the formula 2k + 50 is a linear function of k.
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