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Why did many ancient civilisations use ten and its powers?

ATen fingers on two hands
BTen moons in a year
CTen days in a week
DTen sides of a coin
Answer & Solution
Correct answer: A. Ten fingers on two hands
1. Early people counted using their fingers. 2. There are ten fingers on two hands, so base ten became natural. 3. The other options are not the stated reason. _Source: Wikipedia, Decimal, section Origin_
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