Mathematical Reasoning - Letter Series
16. ABC, CBA, DEF, ... , GHI, IHG
- Option : B
- Explanation : The second term is the reverse order of the first term. In addition to the above types, a number of other types can also be identified.
17. Find the missing letters in the following series.
QAR, RAS, SAT, TAU, __________
- Option : A
- Explanation : The third letter is repeated as the first letter of the next segment. The middle letter, A, remains static. The third letters are in alphabetical order beginning with R.
18. Find the missing letters in the following series.
FTG, GTF, HTI, ITH, __________
- Option : A
- Explanation : The middle letter T is fixed. The first and third letters are swapping their position in second and fourth terms. The first letters are in alphabetical order: F, G, H, I, and J. The missing segment begins with a new letter J.
19. Find the missing letters in the following series.
SCD, TEF, UGH, __________, WKL
- Option : C
- Explanation : For first letter of each triplet, the series is STUVW. The remaining two letters of the series goes like CD, EF, GH, IJ, KL.
20. Find the missing letters in the following series.
JAK, KBL, LCM, MDN, __________
- Option : B
- Explanation : 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.
