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68cm = 4 x 3n - 1
68cm = 12n - 4
12n = 68cm + 4
12n = 72cm
n =
= 6cm
Jadi, ukuran persegi tersebut = 6cm x 6cm
68 = 4(3n-1)
68 = 12n-4
12n = 4 + 68 = 72
n = 72/12 = 6
panjang sisi =6 cm