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A, B are two students whose chance of so...

A, B are two students whose chance of solving a given question correctly are (1/8) and (1/12) respectively. They solve a problem and obtained the same result. If it is 1000 to 1 against their making the same mistake. The chance that the result is correct is a/b (where a and b are natural numbers in lowest form), then total number of divisors of a + b is

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