This number puzzle uses a simple hidden pattern rather than normal addition.
We are given:
2 + 2 = 5
3 + 3 = 7
In each case, add the two numbers normally and then add 1:
2 + 2 + 1 = 5
3 + 3 + 1 = 7
Following the same rule:
4 + 4 + 1 = 9
Answer: 9.
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