In following questions, a sequence of groups of alphabets and numbers is provided with one term missing , Choose the missing term from options.

3F, 6G, 11I, 18L, ?

A. 21O
B. 25N
C. 27P
D. 27Q
E. 25P
Answer: C . 27P


The letters in the first, second, third and fourth terms are respectively moved one, two three and four steps forward to obtain the letter in the subsequent terms.
The two, three and four steps forward by the numbers is + 3, + 5, + 7, + 9.