Question 13
ProgressionsFind the sum of the first five terms of the G.P. 2, 6, 18, ...
- A.484
- B.243
- C.242
- D.130
- E.1
Show the answer and explanation
Answer: C (242)
Explanation
a = 2, r = 3. S5 = 2(35 − 1)/(3 − 1) = 35 − 1 = 242.
Find the sum of the first five terms of the G.P. 2, 6, 18, ...
Answer: C (242)
a = 2, r = 3. S5 = 2(35 − 1)/(3 − 1) = 35 − 1 = 242.