ISRO Scientist or Engineer Civil 2015 Question 72

Question 72

The series $$1+\frac{1}{2^{2}}-\frac{1}{3^{2}}-\frac{1}{4^{2}}-\frac{1}{5^{2}}+\frac{1}{6^{2}}-\frac{1}{7^{2}}-\frac{1}{8^{2}}+............\infty$$ is



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