GATE EC 2026 Set 1 — Question 36
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Engineering Mathematics → Calculus → Sequences, Series & Convergence
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Question
Consider the two series, and , where Which of the following statements is correct for the two given series?
Correct answer
(A) Both S_A and S_B converge.
Solution
1.Analysis of :
Using the Ratio Test for where :Since the limit , the series converges.2.Analysis of :
The series can be split into two separate geometric series:The first part is a geometric series with first term and common ratio . Since , it converges to .The second part is a geometric series with first term and common ratio . Since , it converges to .
Since both parts converge, their sum also converges.Therefore, both and converge.
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