Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?

Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?

2) 6, 13, 28, 59, ?, 249.

3) In the following number series a wrong number is given. Find out the wrong number.
1, 3, 10, 21, 64, 129, 356, 777

4) 165, 195, 255, 285, 345, ?

5) 1, 9, 25, 49, ?, 121. What will come at the place of question mark ?