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II. Find the sum of the following geometric sequence. Use the space below for your solutions in each item.
1. First 20 terms of -1, -2, -4, -8,...
2. Sum of 9, 18, 36, 72,...
3. First 12 terms of 9, 36, 144, 576, ... 4. First 8 terms of 27, 3, 1/3, 1/27, ... 5. Sum of -27, 9, -3, 1, ...
II. Find the sum of the following geometric sequence. Use the space below for your solutions in each item.
1. First 20 terms of -1, -2, -4, -8,...
2. Sum of 9, 18, 36, 72,...
3. First 12 terms of 9, 36, 144, 576, ... 4. First 8 terms of 27, 3, 1/3, 1/27, ... 5. Sum of -27, 9, -3, 1, ...
Answers & Comments
Answer:
For number 2. 135
Step-by-step explanation:
Sn=a1(1-r^n)/1-r
use this general formula for sum of geometric sequence