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\begin{array}{l}{\text { The value of } \frac{1}{2+\sqrt{7}}+\frac{1}{\sqrt{7}+\sqrt{10}}+\ldots+\frac{1}{\sqrt{28}+\sqrt{31}} \text { is }} \\ {\text { (1) } \frac{4-\sqrt{28}}{3}} \\ {\text { (3) } \frac{\sqrt{28}-4}{3}}\end{array} |
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Answer» not understand by me |
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