Find the next three terms of the sequence

Question

1.2,5,8,11,_,_,_
2.1,-3,-7,-11,_,_,_
3.1,4,16,64,_,_,_

Answer 1

1. arithmetic ... add 3 to get next term

2. arithmetic ... subtract 4 to get next term

3. geometric ... multiply by 4 to get next term