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1. Is \( 243 \) a perfect cube?
\(243\) is .
2. Is \( 392 \) a perfect cube? If not, find the smallest natural number by which \(392\) must be multiplied so that the product is a perfect cube.
(i) \(392\) is .
(ii) The smallest number should be multiplied .
(iii) The obtained perfect cube .
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