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Finding Square Root of a Number

If we deduct ...

Question

If we deduct $(20)^{3}$ from the square of a number , the answer is 4321. Find the number :

A

512

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B

777

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C

234

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D

111

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Solution

The correct option is D $111$
Let the required number be x.
Then,
$x^{2} - 8000 = 4321$
$x^{2} = 12321$
$x = 111$

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