0
Anonymous
There are infinitely many options. For example,
Un = (-n5 + 15n4 -85n3 + 230n2 - 279n + 140)/n
The simplest, is
Un = (n2 - n + 4)/2
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tn=5n-3
5
The nth term is: 5-2n
-4n + 24 #1 ; -4(1) +24 = 20 #2 ; -4(2) + 24 = 16 #3 ; =4(3) + 24 = 12
T(n) = 12 - n2