Answer
$\sqrt[10] {y^{9}}$
Work Step by Step
$\sqrt[6] y\sqrt[3] y\sqrt[5] {y^{2}}=y^{1/6}y^{1/3}y^{2/5}=y^{1/6+1/3+2/5}=y^{9/10}=\sqrt[10] {y^{9}}$
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