In "Number Series" question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces

In following questions, one term in number series is incorrect.

Find out the incorrect number 121, 143, 165, 186, 209

A. 143
B. 165
C. 186
D. 209
Answer: C . 186


Each term of the series is increased by 22 to obtain the next term.
So, 186 is wrong and must be replacced by (165 +22)  i.e. 187.