There are plenty of answers to this question. From a mathematical perspective, anything other than the correct answer (which is "2") is not 1+1, e.g., "3", "5+8i", "-17746.5584". If you want an even broader answer, then anything that is not a number ("bananas", "happiness") could be considered "not 1+1". However, this question might be a riddle, in which case the answer could be very versatile and flexible. Do you want me to treat it as a riddle and provide more answers?
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