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Divisibility rules are described as quick for which divisors?
A2 and 5
B3 and 7
C6 and 8
D9 and 4
Answer & Solution
Correct answer: A. 2 and 5
1. Some divisors have an easy visual test.
2. Others, such as eleven, do not.
3. Two and five are the quick ones named.
_Source: OpenStax, Contemporary Mathematics, Ch 3 'Real Number Systems and Number Theory'_
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