ten + ? = eleven, 1, 2, 4, 9, ? + fifteen = eighteen, 1, 3, 5, 11, ? + eight = thirteen, 3, 4, 5, 10, ? + four = nine, 5, 6, 7, 8, ? + three = three, 0, 2, 10, 13, eleven + ? = twelve, 1, 4, 5, 15, ? + two = three, 1, 4, 5, 7, two + ? = six, 1, 2, 4, 8, thirteen + ? = seventeen, 1, 2, 4, 10, ? + two = five, 3, 5, 8, 12

Missing number- addition

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