An arithmetic progression has first term and common difference , where .
The 1st, 4th and 13th terms of this arithmetic progression form a geometric progression.
Find the sum of the first terms of the arithmetic progression.
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An arithmetic progression has first term and common difference , where .
The 1st, 4th and 13th terms of this arithmetic progression form a geometric progression.
Find the sum of the first terms of the arithmetic progression.
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