Complete the series.
9, 12, 10, 13, 11, (...)

Correct option is D

Given:
9, 12, 10, 13, 11, (...)
Solution:
In this series there are two series-
1st series = 9, 10, 11…….. (Difference of each number is +1)
2nd series= 12, 13, 14……..(Difference of each number is +1)
Or
The differences between consecutive terms:
From 9 to 12: +3
From 12 to 10: -2
From 10 to 13: +3
From 13 to 11: -2
The pattern alternates between adding 3 and subtracting 2.
Following this pattern:
The next term after 11 would be: 11 + 3 = 14
Thus, the series is: 9, 12, 10, 13, 11, 14.
Therefore, the correct answer is (d).