Concept:The missing term in a number series is found by identifying the pattern in the differences between consecutive terms.Explanation:Assume the missing number is between −4 and 3.The differences for the later terms are: 8−3=5, 14−8=6, 21−14=7.These differences increase by 1: 5,6,7.Working backwards, the preceding differences should be 4 and 3.So, −4+3=−1, and then −1+4=3.The complete series is: −4,−1,3,8,14,21.
Answer:The missing number is −1, which is option D.
