b. 2n - 1
contoh:
2 × 1 - 1 = 1
2 × 2 - 1 = 3
2 × 3 - 1 = 5
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b. 2n - 1
contoh:
2 × 1 - 1 = 1
2 × 2 - 1 = 3
2 × 3 - 1 = 5