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**By what least number 4320 be multiplied to obtain a number which is a perfect cube?**

** **

32

56

52

50

D. 50

Clearly, 4320 = 2^{3} * 3^{3} * 2^{2} * 5.

To make it a perfect cube, it must be multiplied by 2 * 5^{2 }i=50.