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A number is divisible by 12 if it passes the rules for 4 and:
A3
B5
C9
D7
Answer & Solution
Correct answer: A. 3
1. Twelve breaks into two smaller factors.
2. Both of their rules must hold together.
3. They are 3 and 4.
_Source: OpenStax, Contemporary Mathematics, Ch 3 'Real Number Systems and Number Theory'_
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