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atau kalau egak pakek rumus
U1 = 5000
U3 = 6000
-2 = -1000
b = 500
Un= a + (n-1) b
a = januari
b = beda
karena oktober itu di angka 10
U10 = 5000 + ( 10-1 ) 500
= 5000 + 9.500
= 5000 + 4.500
= 9.5000
jadi bln oktober jumlahnya 9.500. semoga membantu