SOLUTION: Find the 1st element of an arithmetic sequence whose 18th term is 20 and whose common difference is -2.
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-> SOLUTION: Find the 1st element of an arithmetic sequence whose 18th term is 20 and whose common difference is -2.
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Question 1039661: Find the 1st element of an arithmetic sequence whose 18th term is 20 and whose common difference is -2. Answer by ikleyn(52788) (Show Source):
