Question

If it Is possible to make a number which is perfect square of a two-digit odd number with the second, the sixth and the ninth digits of the number 187642539, which of the following is the digit in the unit's place of that two-digit odd number?

• A. 1
• B. 7
• C. 9
• D. No such number can be made

Answer 1

The correct option is B 7

The second, sixth and the ninth digit of the number 187642539 is 8, 2, 9 respectively.
The perfect square that can be made with these digits is 289 which is a perfect square of the odd number 17.
Therefore, the unit digit is 7.
Answer is Option B