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11×2+11×5+13×3+12×7+15×4+… \frac {1}{1 \times 2} + \frac {1}{1 \times 5} + \frac {1}{3 \times 3} + \frac {1}{2 \times 7} + \frac {1}{5 \times 4} + \ldots 1×21+1×51+3×31+2×71+5×41+…
Find the sum of this infinite series.
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