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1^2 = 1
3^2 = 9
........
9^2 = 81
11^2 = 132
13^2 = 169
b. pembagian 2
2:2 = 1
1 : 2 = 1/2
1/2 : 2 = 1/4
c. penambahan 4
7+ 4 = 11
11 + 4 = 15
15 + 4 = 19