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Un = 3n+9
U₂₅?
U₂₅ = 3(25)+9
= 84
itu ditambah bilangan genap selanjutnya
0+2=2
2+4=6
6+6=12
12+8=20
20+10=30
30+12=42
un = 3n+9
u25 = 3 (25)+9
u25 = 75+9
u25 = 84