the first term of an arithmetic sequence is 22 and the sum of the first 21 terms is -1218. find the last term and the common difference.
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the first term of an arithmetic sequence is 22 and the sum of the first 21 terms is -1218. find the last term and the common difference.
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Step-by-step explanation:
the first term of an arithmetic sequence and sum of the first 21 is 12 18 and find the last term and the common difference