Prove that following numbers are irrationals: (i) \( \frac{2}{\sqrt{7}} \) (ii) \( \frac{3}{2 \s...

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Prove that following numbers are irrationals:
(i) \( \frac{2}{\sqrt{7}} \)
(ii) \( \frac{3}{2 \sqrt{5}} \)
(iii) \( 4+\sqrt{2} \)
(iv) \( 5 \sqrt{2} \)
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