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39. The rule here is starting with the number 9, add (-6 + sequence number * 6).

9 + (-6) = 3

3 + 0 = 3

3 + 6 = 9

9 + 12 = 21

21 + 18 = 39

39 + 24 = 63

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12y ago

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2 sequence

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King Zaki

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7mo ago
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Q: What is the next number in this sequence 9 3 3 9 21?
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