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If a=sum(r=1)^oo(1/r)^2, b=sum(r=1)^oo1/...

If `a=sum_(r=1)^oo(1/r)^2, b=sum_(r=1)^oo1/((2r-1)^2), then a/b=` (A) `5/4` (B) `4/5` (C) `3/4` (D) none of these

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