Friday, July 15, 2016

Limit of sequence. with Factorial


Can't find the limit of this sequence : 3n(2n)!n!(2n)n

tried to solve this using the ratio test buy failed... need little help


Answer



What's the problem with the ratio test?:


an+1an=(2n+2)!3n+1(n+1)!(2(n+1))n+1n!(2n)n(2n)!3n=(2n+1)3n+1(nn+1)nn6e>1



and thus...


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