Answer Within A Minute III

Algebra Level 1

13×35×57×79×911××4749\frac{1}{3} \times \frac{3}{5} \times \frac{5}{7} \times \frac{7}{9} \times \frac{9}{11} \times \cdots \times \frac{47}{49}

If the value of the expression above equals ab \frac ab for coprime positive integers aa and bb, find the value of a+ba+b.

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