Question

What could be the possible 'one's' digit of the square root of each of the following numbers?
$9801$
$99856$

• A. $1or9;4or6$
• B. $2or8;4or6$
• C. $1or9;2or8$
• D. $2or8;5or0$

Answer 1

Answer: (A)

$1or9;4or6$

As we know that all the perfect square number ends with $1,4,9,6,5,00$

Thus, the possible unit digit of square root of 9801 is either 1 or 9 and it will odd square root and the possible unit digit of square root of 99856 is either 4 or 6 and it will have even square root.