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Q.

What are the two possible units digit of the square root of 9801?


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a

1 or 9

b

2 or 8

c

1 or 8

d

2 or 9 

answer is A.

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Detailed Solution

Given number is 9801.
As we know that all the perfect square number ends with 1,4,9,6,5,00.
Square of 1 end in 1 and square of 9 end in 1.
Thus, the possible unit digit of square root of 9801 is either 1 or 9 and it will be an odd square root.
Therefore, option (1) is correct.
 
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