Determine if the sequence could be arithmetic. if so give the common difference -7, 1,7,13,18,

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An arithmetic sequence will increase by the same amount called the common difference (d) Here d for first 2 terms = 1 - -7 = 8 , then 7-1 = 6 , then 13/7 = 6 and 18-13 = 5 so it is not arithmetic.

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