Question

9) WHAT COULD BE THE POSSIBLE ONE'S DIGIT OF THE SQUARE ROOT OF 121?
3,4
7,8
6,7
1,9​

Answer 1

We all no it’s 1.
Therefore, 1 &9-correct

Answer 2

Given : square root of 121

To Find :  possible units place digit of the square root of 121

Solution:

Unit Digit of x          unit digit of x²

1                                 1

2                                4

3                                9

4                                6

5                                5

6                                6

7                                9

8                                4

9                               1

0                                0

121 is square number   and has unit digit 1

Corresponding unit digit in square root are  1  and 9

Hence the possible units place digit of the square root of 121

are  1 and 9

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