What are the next three terms in the sequences below?

1. 2, 5, 7, 12,

2. 9, 11, 20, 31,

3. 2, 5, 10, 50,

4. 1, 3, 3, 9,

2, 5, 7, 12, 19, 31, 50 
every number equals the two before it 7=5+2 

9, 11, 20, 31, 51, 82, 133 
every number equals the two before it 20=9+11 

2, 5, 10, 50, 500, 25000 ,12500000 
each number equals the two numbers before it multiplied 10=5*2 

1, 3, 3, 9, 27, 243, 6561 
ach number equals the two numbers before it multiplied 3=1*3

BRAINLIEST PLS!!!

19, 31, 50
51, 82, 133
500, 25000, 12500000
27, 243, 6561