index form of the following
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4
√16a^2b^3
=4
√(2×2×2×2a^2b^3
=2a^2/4b^3/4
=2a^1/2b^3/4
3
√27a^3b^2
=3
√3×3×3a^3b^2
=3a^3/3b^2/3
=3ab^2/3
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