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

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