2 + ? = 3, 1, 4, 6, 7, 1 + ? = 3, 2, 7, 8, 15, 6 + ? = 11, 4, 5, 6, 10, ? + 11 = 18, 6, 7, 8, 10, 1 + ? = 11, 5, 7, 10, 16, ? + 1 = 13, 12, 15, 18, 13, 13 + ? = 18, 5, 7, 9, 11, ? + 13 = 13, 0, 1, 4, 14, ? + 4 = 12, 2, 7, 8, 11, ? + 15 = 19, 4, 3, 5, 10, 3 + ? = 7, 4, 6, 7, 11, ? + 2 = 10, 1, 4, 5, 8, 15 + ? = 20, 5, 3, 6, 10, 2 + ? = 18, 14, 16, 17, 20, 7 + ? = 14, 7, 8, 3, 6.

Math: Missing number

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