Without doing the actual addition, find the sum of:

1 + 3 + 5 + 7 + 9 + …………… + 51 + 53

Write three sets of Pythagorean triplets such that each set has numbers less than 30.

The number of digits in the square root of 1210000 is :

1. 2

2. 4

3. 3

4. 5

The greatest 3-digit perfect square number is :

1. 121

2. 961

3. 100

4. 900