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OpenStudy (anonymous):
next number in sequence 1, -2, 5, 2, 9, 6, 13 ?
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OpenStudy (mathstudent55):
1, -2: To go from 1 to -2, subtract 3 -2, 5: To go from -2 to 5, add 7 5, 2: To go from 5 to 2, subtract 3 2, 9: To go from 2 to 9, add 7 Now look at the pattern of going from one number to the next one starting at 1: -3, + 7, - 3, + 7
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