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Which pair of rules is combined to test for 12?
A2 and 5
B4 and 9
C3 and 4
D2 and 3
Answer & Solution
Correct answer: C. 3 and 4
1. Twelve is three times four.
2. Each factor brings its own rule.
3. The pair is 3 and 4.
_Source: OpenStax, Contemporary Mathematics, Ch 3 'Real Number Systems and Number Theory'_
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