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OpenStudy (anonymous):
Which of the following helps you to determine that 279 is divisible by 9? A: 79 is divisible by 9. B: 2 + 7 + 9 is divisible by 9. C: The last digit is a 9. D: 9 is divisible by 9.
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OpenStudy (anonymous):
2+7+9=18 => 1+8 =9 so B is correct
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