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The series is obtained by subtracting a number that reduces by 1 at each stage

18 - 5 = 13

13 - 4 = 9

9 - 3 = 6

6 - 2 = 4

4 - 1 = 3

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14y ago
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Q: Which is the next number is the series 18 13 9 6 4?
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