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kalo 3 gelas jadi 18 cm . berarti menambah 3 cm
a = 12 cm
U2 = 15 cm
b = 3
yang di cari = u 20
U20 = a + (n-1) b
U20 = 12 + 19 x 3
U20 = 12 + 57
U20 = 69