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$\left(\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+\frac{1}{9.11}+\frac{1}{11.13}+\frac{1}{13.15}\right)$ is equal to1). $\frac{2}{45}$2). $\frac{4}{45}$3). $\frac{7}{45}$4). $\frac{2}{15}$ |
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