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1 3 8 19 ? 5 14 35 80 ? first row 1 1 * 2 + 1 = 3 3 * 2 + 2 = 8 8 * 2 + 3 = 19 19 * 2 + 4 = 42 <-- missing number (42 * 2 + 5 = 89) second row 1 * 2 + 3 = 5 3 * 2 + 8 = 14 8 * 2 + 19 = 35 19 * 2 + 42 = 80 42 * 2 + 89 = 173 <-- missing number 42 + 173 = 215 |