In an AP of five terms, the sum of the last four terms is 38, and the product of the second and the fifth terms is 70. Find the terms of the progression.
3. a) Find the 12 th term of the GP, if the second term is 75 and the 5 th term is -3/5.
b) Find the 45 th term of the GP, if the 20 th term is 1200 and the 30 th term is also 1200.