Determine whether the sequence is arithmetic. If so, find the common difference. 1. 5, 1, 7, 13,

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Determine whether the sequence is arithmetic. If so, find the common difference.
1. 5, −1, −7, −13, −19, . . .
2. 0, 1, 3, 6, 10, . . .
3. 1, 8, 1/4, ½, 1, 2, . . . .
4. 1, 15/16, 7/8, 13/16, 3/4, . . . .
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