Find the least number which must be added to 5483 so that the resulting number is a perfect square.

The value of 18² - 17² is :

1. 1

2. -1

3. 35

4. none of the above

24² has n at its unit place, the value of n is:

1. 4

2. 16

3. 576

4. 6

A number ends with 5 zeros, the number of zeros in its square will be :

1. 5

2. 25

3. 10

4. 8