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yang habis dibagi 2 ada 10 angka yaitu 20.18.16.14.12.10.8.6.4.2
20=2².5
18=2.9
16=2⁴
14=2.7
12=2².3
10=2.5
8=2³
6=2.3
4=2²
2=2
jadi 2ⁿ = 2²⁺¹⁺⁴⁺¹⁺²⁺¹⁺³⁺¹⁺²⁺¹ = 2¹⁸
n=18