Find the cube root of 389017 by finding their units and digits .

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answer is C.

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Detailed Solution

Concept- Solving for Cube root by performing calculation on units and tens digit
Given, 389017
Here, the unit digit is 7
⸫ The unit digit of its cube root is 3…….[33 = 27]
After grouping the last three digits from the right, the number left is 389.
Now, 73 = 343< 389 and 83 = 512 > 389
The tens digit of the cube root is 7.

So,
Hence, the correct option is 3.

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