\(A=\dfrac{1}{2}+\dfrac{1}{6}+\dfrac{1}{12}+-.+\dfrac{1}{10000}\)

\(B=\dfrac{2}{1\cdot3}+\dfrac{2}{3\cdot5}+\dfrac{2}{5\cdot7}+-+\dfrac{2}{99\cdot101}\)

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