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प्रश्न
State, with reason, of the following is surd or not :
`root(5)(128)`
उत्तर
`root(5)(128) = root(5)(2 xx 2xx 2 xx 2 xx 2 xx 2 xx 2) = 2 root(5)(4)`
∴ `root(5)(128)` is a surds.
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