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The answer is 8.1 based on fitting the following opition to value rule: Un = (-6n4 + 61n3 - 216n2 + 431n - 150)/60 for n = 1, 2, 3, ...
91
The best choice for the next term after those shown is 75 .We have no way to know whether or not that will 'complete' the sequence.
3 ,
There is no useful or suitable method shown on the list below.