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1. Twentieth term of a radical sequence ●●○○○ 20 ptsConsider the sequence $\sqrt{2}$, $-2$, $\sqrt{6}$, $-2\sqrt{2}$, $\sqrt{10}$, $-2\sqrt{3}$, $\ldots$. Following this pattern, find the 20th number in the sequence. Round to two decimal places.