For first letter of each triplet, the series is STUVW.
The remaining two letters of the series goes like CD, EF,
GH, IJ, KL.
Logical Reasoning MCQ - Number and Letter Series
This is an alternating series in alphabetical order.
The middle letters follow the order ABCDE. The first
and third letters of the triplets are in alphabetical order
beginning with J. The third letter is repeated as a first
letter in each subsequent three−letter segment.
If we look at the alphabetic series,
the difference between first letters of all pairs is three.
Moreover, the difference between two letters in each
pair is ten. Hence, MW is the answer.
The second and fourth letters in the series, L and T
are static. The first and third letters consist of an alphabetical order beginning with the letter E.
| First Letter | Second Letter |
| W – 4 = S | E + 2 = G |
| S – 3 = P | G + 3 = J |
| P – 4 = L | J + 4 = N |
| L – 3 = I | N + 5 = S |
Thus (a) is the right answer.
