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[–] MrPim ago 

Definitely 3

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[–] 14747004? [S] ago 

Why 3 and not some other number?

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[–] MrPim 0 points 1 point (+1|-0) ago  (edited ago)

There are two sets of numbers. 23+1=24, 1*2=2, now 24+2=26, 26+2=28 and so on

21-2=19, 2*2=4, now 19-4=15, 5-4=11 and so on til 3 is the next number.

Edit, wait. I'll leave this but 36 doesn't work now that I look. I may have to revise my answer