What should come in place of the question mark (?) in the given series?
138, 137, 140, 139, 142, (?)

Correct option is B

Given: The series is: 138, 137, 140, 139, 142, (?)
Concept: (–1, +3, –1, +3, –1) pattern follow.
Explanation:
To find the pattern in the series, let’s look at the difference between the consecutive numbers:
The difference between 138 and 137 is 1 (138 – 1 = 137)
The difference between 137 and 140 is 3 (137 + 3 = 140)
The difference between 140 and 139 is 1 (104 – 1 = 139)
The difference between 139 and 142 is 3 (139 + 3 = 142)
So, the next difference should follow the pattern. Continuing this pattern, the next difference should be 1.
Therefore, the next term in the series should be 142 – 1 = 141.