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U2= 8
b = 8-4 =4
Un = U1 + (n-1)b
=4 +(n-1)4
=4 + 4n - 4
=4n
g kedua =8 bola
g ketiga =12 bola
g ke-n =... bola
4 : 8 : 12 : n =1 : 2 : 3 : n
berarti setiap gambar ditambah kan 4 bola
4×1=4
4×2=8
4×3=12
4×n=4n