2 - 2 x 1, 4 - 2 x 2, 6 - 2 x 3, 8 - 2 x 4, 10 - 2 x 5, 12 - 2 x 6, 14 - 2 x 7, 16 - 2 x 8, 18 - 2 x 9, 20 - 2 x 10,

multiplicação X 2

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