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18
3 + 1 = 4
4 + 2 = 6
6 + 3 = 9
9 + 4 = 13

Etc. The next number in the sequence would be 18, then 25, and so on.

Ans 2.

The previous answer contains an error.
The next number in the sequence would be 18 (13 + 5),

after which comes 24 (18 + 6 ) not 25.

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15y ago

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