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NIELIT 2017 DEC Scientist B - Section B: 9

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For y * 162 to be perfect cube, each of its factor should have frequency 3.
factorization of 162 = 9 * 9 * 2. Therefore, for y to be smallest it should have one 9 and two 2's.

=> y = 2 * 2 * 9 = 36.
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