Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series.
136, 135, 137, 136, 138, 137, ?
Option 1: 136
Option 2: 140
Option 3: 138
Option 4: 139
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Correct Answer: 139
Solution :
Given:
136, 135, 137, 136, 138, 137, ?
Subtract 1 and add 2 in each alternative term to get the next number in the series.
So, 139 is the missing term in the series. Hence, the fourth option is correct.
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