Find the option that does not fit the series pattern:
7, 12, 19, 28, 39, 51, 67, 84
Show answer & explanation
Correct answer: D
Explanation
Given series:
7, 12, 19, 28, 39, 51, 67, 84
Check the differences between consecutive terms:
12 − 7 = 5
19 − 12 = 7
28 − 19 = 9
39 − 28 = 11
51 − 39 = 12 (it should be 13 instead of 12)
67 − 51 = 16
84 − 67 = 17
The differences should follow consecutive odd numbers:
5, 7, 9, 11, 13, 15, 17
But instead of 13, we get 12 at the step of 51.
If we add 13 to 39, we get 52, not 51.
So, 51 breaks the pattern.
Hence, the correct answer is option (4).