Sum and Product of Terms by Python

1. Let tn = 2n - 1, where n >= 1.
   Find the answer of the following by a 'for' loop of Python:
   
   
   
   
2. Let tn = 2n - 1, where n >= 1.
   Find the answer of the following by a 'while' of Python:
   
   
   
   
3. Let x1 = 2, and xn = 3 + xn-1, where n >= 2.
   Find the answer of the following by loops of Python: