Maths-
General
Easy
Question
- 9+6i
- 9-6i
Hint:
The sum of infinite GP is the sum of an infinite number of terms of a geometric progression (GP). We may think that the sum of an infinite number of terms is infinity always. But this is NOT true in the case of an infinite GP. The sum of infinite GP is a finite number when the absolute value of its common ratio is less than 1.
The correct answer is:
we can summarize the sum of GP formulas as follows:
- S∞ = a / (1 - r) when |r| < 1
- S∞ = ±∞, when |r| ≥ 1
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