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21-05-2016
Mathematics

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What's the next number? 12 21 23 32 34 43

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21-05-2016

The correct answer is 45. The rule to the numbers is x + 9 and then x + 2.

12 + 9 = 21
21 + 2 = 23
23 + 9 = 32
32 + 2 = 34
34 + 9 = 43
43 + 2 = 45

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