ROWS: (3RD number ÷ 1st number) + (1st number - 1) = middle numberIn 1st row,(18 ÷ 2) + (2 - 1) = 9 + 1 = 10In 2RD row,(84 ÷ 3) + (3 - 1) = 28 + 2 = 30In 3rd row,(? ÷ 4) + (4 - 1) = 68? ÷ 4 = 68 - 3 = 65? = 65 × 4 = 260Hence, "260" is the CORRECT answer.