Which term of the series 5, 10, 20, 40, ..... is 1280?
A. 10th
B. 9th
C. 8th
D. None of these
Answer: Option B
Solution(By Examveda Team)
Clearly, 5 x 2 = 10, 10 x 2 = 20, 20 x 2 = 40,.....So, the series is a G.P. in which a = 5 and r = 2.
Let 1280 be the rath term of the series.
Then, 5x2n-1 = 1280 ⇔ 2n-1 = 256 = 28 ⇔ n - 1 = 8 ⇔ n = 9.
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