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Given that $$1 + \frac{1}{2^2} + \frac{1}{3^2} + \frac{1}{4^2} + ...... = \frac{\pi^2}{6}$$, the value of $$1 + \frac{1}{3^2} + \frac{1}{5^2} + \frac{1}{7^2} + ......$$ is
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