What is the greatest number of four digits which is a perfect square?a...
Greatest number of four digits = 9999


What is the greatest number of four digits which is a perfect square?a...
Explanation:
The greatest number of four digits is 9999. To find the greatest four-digit perfect square, we need to find the largest perfect square that is less than or equal to 9999.
Finding the perfect squares:
- The square of 100 is 10000, which is greater than 9999.
- The square of 99 is 9801, which is the largest perfect square less than 9999.
Therefore, the greatest number of four digits which is a perfect square is 9801.
Conclusion:
The correct answer is option 'a) 9801'.