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anonymous
 5 years ago
i need to find if the series converges or diverges using ratio test: sum of all ((n^2)(n+2)!)/(n!*3^(2n)) when n=1 to info
anonymous
 5 years ago
i need to find if the series converges or diverges using ratio test: sum of all ((n^2)(n+2)!)/(n!*3^(2n)) when n=1 to info

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0by the ratio test, this series converges. Are you having trouble setting up the ratio test?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0yes definitely having trouble seeing how stuff cancels once i set up An+1 over !n

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i meant An instead of !n

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I keep trying to type it in the equation solver, but it doesnt take

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I mean the equation formater

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0you can write things like (n+1)! as n! (n+1)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0and (n+3)! as (n+2)*(n!)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i was doing that but i must be doing something wrong because I keep getting left with (n+1)(n+3)n! over 9n\[^{2}\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.09n^2. sorry im a noob

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0let me see what I am left with...

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0You will be left with a 9n^2 and (n+2) in the denominator

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0but remember, you are taking the limit as n goes to infinity

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0what i dont get is doesnt the (n+3)! over (n+2)! cancel out as just (n+3) in the numerator

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0never mind. after some factorial expansion, everything cancels out and you are left with (n+1)(n+3) over 9n^2 and do the nth term test, then take the limit and it eventually equals to (1/9) which is <1. BOOM roasted
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