Insert the missing number: 12, 21, 23, 32, 34, _____?
- 43
- 32
- 22
- None of these
Explanation
The pattern of the sequence appears to be an alternating addition of 9 and 2:
12 + 9 = 21
21 + 2 = 23
23 + 9 = 32
32 + 2 = 34
34 + 9 = 43
So, the missing number is: 43
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