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yes . the answer is 77 .
No - 7/77 = 0.09 recurring (that is, 0.090909...). However, 77 is divisible by 7.
No.
2 + 3 + 1 = 6, which is divisible by 3, so 231 is divisible by 3. Divide to get 231 = 77 Hard to miss that this is divisible by 7, so we get 231 = 3*7*11
No. 319 is divisible by: 1, 11, 29, 319.