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Q.

Find the greatest 4 digits number which is a perfect square.


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a

9801

b

9999

c

1000

d

9898 

answer is A.

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Detailed Solution

We know that
The greatest 4-digit number = 9999
Now we have found the perfect square by using long division method of given number,
Question ImageThus, the remainder = 198
When we subtract 198 form 9999 we obtain a perfect square.
9999 − 198 = 9801
Here,
9801=99.
Hence the greatest 4 digits number which is a perfect square = 9801.
Correct option is 1.
 
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