Which of the following numbers will replace the question mark (?) in the given series?
67, 78, 71, 82, 75, 86,?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e.79.
The series follows this pattern:
67 + 11 = 78, 78 - 7 = 71, 71 + 11 = 82, 82 - 7 = 75, 75 + 11 = 86, 86 - 7 = 79