Question : Directions: Select the number that can replace the question mark (?) in the following series. 105, 107, 103, ?, 101, 111
Option 1: 102
Option 2: 97
Option 3: 113
Option 4: 109
Correct Answer: 109
Solution : Given: 105, 107, 103, ?, 101, 111
Add and subtract consecutive even numbers alternately starting from 2 – 105 + 2 = 107; 107 – 4 = 103; 103 + 6 = 109; 109 – 8 = 101; 101 + 10 = 111
So, 109 is the missing number of the series. Hence, the fourth option is correct.
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