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Pola ke-1 = 2 bola = 1.2 bola
Pola ke-2 = 4 bola = 2.2 bola
Pola ke-3 = 6 bola = 3.2 bola
Pola ke-n = n.2 = 2n
Maka pola ke-100 terdapat 2(100) bola = 200 bola
Cara 2
a = 2
b = 4-2 = 2
b=2
Un= a+(n-1)b
U100 = 2+(100-1).2
= 2+99.2
= 2+198
= 200