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找规律,你能算出最终答案吗? 1. 11 + 11 = 4 2. 12 + 12

找规律,你能算出最终答案吗?
1. 11 + 11 = 4
2. 12 + 12 = 9
3. 13 + 13 = 16
4. 20 + 20 =?