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b=17-20=-3
un=a+(n-1)b
=20+(n-1)-3
=20-3n+3
=23-3n (a)
kalau menurut ku sih itu,,,,,,
sebagai contoh :
U1 = 23 - 3.1
= 23 - 3 = 20
U2 = 23 - 3.2
= 23 - 3 = 17 dan seterusnya