In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.

G4T, J10R, M20P, P43N, S90L

A. G4T
B. J10R
C. M20P
D. P43N
E. S90L
Answer: B . J10R


The first letter of each term is moved three steps forward and
the last letter is moved two steps backward to obatin the corresponding letters of the next term.
The numbers follow the sequence x 2 + 1, x 2 + 2, x 2 + 3, x 2 + 4.
So, 10 is wrong and must be replaced by (4 x 2 + 1)  i.e. 9.