1.

Determine the interval and radius of convergence for the power series: ∞∑n=17^n/n(3x−1)^n-1.(a) (2x+1)/6(b) 7|3x−1|(c) 5|x+1|(d) 3!*|4x−9|This question was posed to me in quiz.Enquiry is from Discrete Probability in portion Discrete Probability of Discrete Mathematics

Answer»

Correct option is (b) 7|3x−1|

Easiest EXPLANATION: Okay, LET’s start off with the Ratio TEST to get our HANDS on L = limn→ ∞∣7^N+1(3x−1)^n/(n+1)^n7^n(3x−1)^n-1∣=limn→∞∣7^n(3x−1)^n+1∣=|3x−1|limn→∞7^n/(3n-1)=7|3x−1|.



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