Thursday, February 28, 2019

Find limit of this decreasing sequence



an=(1122)(1132)(1142)(11n2)



I have proved that this sequence is decreasing. However I am trying to figure out how to find its limit.


Answer



Hint: Rewrite each 11k2 as (k1)(k+1)k2 and observe the mass cancellations. It will be useful to do this explicitly for say the product of the first 5 terms.



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