Question : Directions: Which of the following numbers will replace the question mark (?) in the given series?
67, 78, 71, 82, 75, 86, ?
Option 1: 97
Option 2: 92
Option 3: 84
Option 4: 79
Correct Answer: 79
Solution :
Given:
67, 78, 71, 82, 75, 86, ?
In the above-given series, add 11 and subtract 7 alternatively from the previous number to get the next number of the series.
67 + 11 = 78; 78 – 7 = 71; 71 + 11 = 82; 82 – 7 = 75; 75 + 11 = 86; 86 – 7 = 79
So, 79 is the missing number of the series. Hence, the fourth option is correct.
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