2. Find the terms of geometric sequence where thr first term is 1, the last term is 16,807 and the common ratio is 7

3 Determine the number of terms in the geometric sequence if a1-- 2, r=5, Sn = --63.


4. what is the sum of the first 100 terms in the sequence --6, 6, --6, 6, --6, 6 ...?


6. What is the sum to infinity of the sequence 8, 4, 2, 1, ...? ​