Question

4. Which is not a unit digit of a
perfect square
6
1
9
8​

Answer 1

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E.g. 81, 121, 441, 961 all are Perfect Square having unit digit 1 and tens digit is even. – If unit digit of a number is 2 then it can't be a perfect square. – If unit digit of a number is 3 then it can't be a perfect square. – If unit digit of a perfect square is 4 then ten's digit has to be Even

Answer 2

Step-by-step explanation:

8 is the answer because square of any number will not give 8 at unit digit..

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