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->tent = un?
a=8, b=2
Un = a+(n-1)b
=8+(n-1)2
=8+2n-2
=2n+6.
a = 8
b = -2
Un = a + (n - 1)b
Un = 8 + (n - 1)-2
Un = 8 - 2n + 2
Un = -2n + 10
semoga benar yaa... ;-)