PRC-2 · Chapter 3 · Question 7 of 45
Under what condition can the sum of an infinite geometric series be calculated using the convergence formula S = a / (1 - r)?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: C) When the common ratio r is between -1 and 1.
Explanation
As the number of terms approaches infinity, the sequence's sum can only converge to a finite value using S = a / (1 - r) if the common ratio 'r' is a fraction between -1 and 1.
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