Find the least number which must be added to 6412 so as to get a perfect square. Also find the square root of the perfect square.

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147; 81

147; 83

149; 81

149; 83

answer is C.

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Detailed Solution

Concept: We have to add some numbers. Then we will find the square root.
Given 6412
The first digit is 64 which is 8
Let the number at the unit place be 1.
And here which is 81 squares is 6561.
we should know which numbers we can subtract.

on the fraction of 6561 is

square root is

Hence, the correct option is (3) .

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