Sum and Product of Terms

  1. Let tn = 2n - 1, where n >= 1.
    Find the answer of the following by hands:



  2. Let tn = 2n - 1, where n >= 1.
    Find the answer of the following by hands:



  3. Let t1 = 2, and tn = 3 + tn-1, where n >= 2.
    Find the answer of the following by hands: