Which is the greatest 5 digit perfect square number?

99525

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99256

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99552

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99856

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Solution

The correct option is D
99856

Greatest 5 digit number = 99999

We need to find out the smallest number that must be subtracted from 99999 to get a prefect square.

We can observe that 143 is the remainder.

So, if we subtract 143 from 99999, we will get a perfect square,

Largest 5 digit perfect square = 99999 - 143

= 99856

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