Sequence and Series

Algebra Level 4

If a=r=11r2\displaystyle a=\sum_{r=1}^\infty \dfrac1{r^2} and b=r=11(2r1)2\displaystyle b=\sum_{r=1}^\infty \dfrac1{(2r-1)^2}, find 3ab\dfrac{3a}{b}.

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