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b= -3
Un= a+(n-1)b
u45 = 40 + (45-1)-3
= 40 + (44) -3
= 40 - 132
= -92
klau gk salah itu barisan aritmatika
U45=a+(45-1)b
=40+44.1/3
= 40+14,67
=54,67