A few extraterrestrials arrived. They had two hands, but claimed that 3 + 2 = 11. How

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A few extraterrestrials arrived. They had two hands, but claimed that 3 + 2 = 11. How many fingers did they have on their two hands? Our decimal system (and ten characters: 0, 1, 2,∙∙∙, 9) surely has its origin because we have ten fingers.
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