Question 922031
All you ask for is n-th term, means you just examine to identify the sequence pattern.  Q # 2 should be obvious.


Q # 1, is almost as simple.
3/10, 3/10^2, 3/10^3, 3/10^4, .....
The exponent on the 10 is the same as the index of the term.  The first term is {{{3/10^1}}}.


n-th Term is {{{3/10^n}}}.