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There are two interwoven series.

A) 2,5,10,17 2 + 3 = 5 : 5 + 5 = 10 : 10 + 7 = 17

Each term takes the previous term and adds increasing odd numbers starting with 3.

B) 9,13,19....and then 27 9 + 4 = 13 : 13 + 6 = 19 : 19 + 8 = 27

Each term takes the previous term and adds increasing even numbers starting with 4.

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12y ago

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