Concept:The series follows a pattern where the difference between consecutive terms increases by a constant amount.Explanation:Find the differences between given terms: 175 - 140 = 35, 213 - 175 = 38, 254 - 213 = 41.These differences increase by 3 each time (35, 38, 41).So the first difference (from the missing term to 140) must be 35 - 3 = 32.Subtract this difference from 140: 140 - 32 = 108.Thus, the missing term is 108.