easy · GMAT Quant

Which of the following correctly states the rule for divisibility by 9?

1. The last two digits must form a number divisible by 9
2. The number must be even and divisible by 3
3. The last digit of the number must be 9
4. The sum of the number's digits must be divisible by 9
5. The number must be divisible by both 3 and 4

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