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The logic is,
1 = 1 $$\times$$ 2 - 1 = 1,Â
2 = 2 $$\times$$ 2 - 1 =Â 3,Â
3 = 3Â $$\times$$ 2 - 1 =Â 5,
4 = 4Â $$\times$$ 2 - 1 =Â 7,Â
5 = 5Â $$\times$$ 2 - 1 = 9
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