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2012/u3= 96
dit 2015/u6........?
penye: u1= a
u3=a + 2b
24=a
96=a + 2b _
-72=-2b
-72/-2=b
36 =b
u6= a + (n-1)b
= 24 + (6-1)36
= 24 + (5)36
= 24 +180
u6= 204