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MathNet 2019-part-06 — 184 problems (EN–VI) Question 134

Math Olympiad Vault · MathNet 2019-part-06 — 184 problems (EN–VI)

Question 134

Let $b=\sqrt[2019]{\sqrt[2018]{\ldots \sqrt[4]{\sqrt[3]{\sqrt[2]{a}}}}},\ a\gt 0$. Which expression is equivalent to $\sqrt[2020]{\sqrt[2019]{\sqrt[2018]{\ldots \sqrt[4]{\sqrt[3]{a^{404}}}}}}$ ?

(A) $\sqrt[2020]{b}$
(B) $\sqrt[5]{b}$
(C) $\sqrt[5]{b^{2}}$
(D) $b^{404}$
(E) $b^{202}$