Complete the series: 2, 5, 11, 23, 47:

Which is the greatest three digit number?

If three numbers are in the ratio 1:2:6. Sum of these numbers is 180. Then any one of these numbers is :

If the following numbers are written in ascending order, which will be the second digit of the second number :

467, 373, 411, 317, 534, 337, 587

If the difference of the squares of two consecutive odd numbers is 40, then one of the number is :