Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series. 72, 85, 68, 81, ?, 77
Option 1: 70
Option 2: 61
Option 3: 64
Option 4: 67
Correct Answer: 64
Solution : Given: 72, 85, 68, 81, ?, 77
Add 13 and subtract 17 alternatively from each term of the series to get the missing term of the series. 72 + 13 = 85; 85 – 17 = 68; 68 + 13 = 81; 81 – 17 = 64; 64 + 13 = 77
So, 64 is the missing number. Hence, the third option is correct.
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