\(a\) and \(b\) are positive integers less than or equal to \(9.\) If \(a\) and \(b\) are assembled into the six-digit

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\(a\) and \(b\) are positive integers less than or equal to \(9.\) If \(a\) and \(b\) are assembled into the six-digit number \(ababab,\) which of the following must be a factor of \(ababab?\)

(A) 3
(B) 4
(C) 5
(D) 6
(E) none of the above

Answer: A

Source: Manhattan GMAT
Source: — Problem Solving |