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The difference between two successive numbers starts with 11 and and then reduces by 3 but the sign alternates at each step

4 + 11 = 15 . . . (11 - 3) = 8 but the sign changes so it becomes -8

15 - 8 = 7 . . . (8 - 3) = 5

7 + 5 = 12 . . .(5 - 3) = 2 but the sign changes so it becomes -2

12 - 2 = 10 . . .(2 - 3) = -1

10 - 1 = 9 . . .(-1 - 3) = -4 but the sign changes so it becomes 4

9 + 4 = 13 . . . and so on

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