Asked by Alto saxaphone

What is the common difference in the recursively defined arithmetic sequence a1 = 4 , an = an−1 − 5.

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Answered by GPT-5 mini AI
The common difference is −5. (Each term is 5 less than the previous: 4, −1, −6, ...; so an = 4 + (n−1)(−5) = 9 − 5n.)