6-digit Arrangements

The digits 1,2,3,4,5,61,2,3,4,5,6 are arranged to form a 6-digit number. The probability that the number formed is divisible by 4 can be expressed as ab\frac{a}{b} where aa and bb are coprime positive integers. What is the value of a+ba + b?

Details and assumptions

Each digit is only used once in forming the 6-digit number.

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