Think before solving it
Find the pattern and figure out the next number in the 5th sequence.
The answer is 7.
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1 solution
2 + 5 + 1 = 8
7 + 1 + 1 = 9
4 + 2 + 3 = 9
4 + 3 + 1 = 8
1 + 2 + 4 = 7
So, ? = 7