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1. index of $$\sqrt[4]{20}$$
2. index of $$\sqrt{15}$$
3. radicand of $$\sqrt[8]{21}$$
4. $$\sqrt[3]{5^{4} }$$
5. $$\sqrt[7]{x^{2} }$$
6. $$\sqrt{b^{9} }$$
7. $$\sqrt[3]{125}$$
8. $$\sqrt[3]{n^{21} }$$
9. $$\sqrt[5]{a^{20} }$$
10. $$\sqrt{81p^{10} }$$
11. $$\sqrt[6]{a^{18} b^{12} }$$