Concept:The sequence follows a pattern where the differences between consecutive terms increase by a constant value (common second difference).Explanation:Find differences: 18−10=8, 28−18=10, 40−28=12, 54−40=14.Differences increase by 2 each step: 8,10,12,14.Next difference should be 16, so missing term =54+16=70.Check: 70+18=88 (last difference 18), confirming pattern.Answer:70