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Our counting system uses place values based on powers of:
A10
B20
C60
D12
Answer & Solution
Correct answer: A. 10
1. Each position is worth ten times the one to its right.
2. That is what makes the system decimal.
3. The base is powers of 10.
_Source: OpenStax, Contemporary Mathematics, Ch 4 'Number Representation and Calculation'_
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