Question

The following number is obviously not perfect square. Give reason.
505050

• A. Don't have even number of zeros at the end so they are not perfect squares
• B. Don't have odd number of zeros at the end so they are not perfect squares
• C. Ambiguous
• D. Data insufficient
  

Answer 1

The correct option is A Don't have even number of zeros at the end so they are not perfect squares

The number end with $0,1,4,5,6,9$

First criteria is followed, but when a number ends with $0$, it should have even number of zeroes at the end for it to be perfect square.

$505050$ has $1$ zero in the end, so it is not a perfect square.

Hence, Option A is correct.