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To test divisibility by 9, add the digits and check divisibility by:
A6
B7
C9
D3
Answer & Solution
Correct answer: C. 9
1. The method matches the rule for three.
2. Only the target divisor changes.
3. The digit sum must divide by 9.
_Source: OpenStax, Contemporary Mathematics, Ch 3 'Real Number Systems and Number Theory'_
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