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OpenStudy (1dfanatic):
Write in the missing digit to make this number divisible by 9. 7_1 (just type the one number missing)
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OpenStudy (phi):
a number is divisible by 9 if the sum of its digits is divisible by 9
OpenStudy (anonymous):
When phi says sum of digits, it means 7+missing digit +1 =9 Since 7+1=8, the missing digit is what number?
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