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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