Question

what could be the possible units place digit of the square root of 121 ?
a) 1,9 ( ) b) 3,4 ( ) c) 6,7 ( ) d) 7,8 ( )​

Answer 1

Answer:

1,9 is possible unit place digit of the square root of 121

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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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