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Mathematics, 21.04.2021 14:00 hijrjdkfjd
An arithmetic sequence has first term (a) and the common difference (d). The sum of the first 25 terms is 15 times the sum of the first 4 terms. Find (a) ​
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An arithmetic sequence has first term (a) and the common difference (d). The sum of the first 25 ter...
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