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U1=a=34
U6=34+b(5)=19
b=-3
Un=34-3(n-1)
U11=34-3(10)=4
U6 = 19
cari beda(b)
Un = a+(n-1)b
U11 = a +(11-1)-3
U11 = 34 + (10 x -3)
U11 = 34 + -30
U11 = 34-30
U11 = 4