Mathematical Reasoning - Letter Series

21. Find the missing letters in the following series.
AK, EO, IS, __________, QA, UE

  • Option : B
  • Explanation : 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.
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22. Find the missing letters in the following series.
ELFT, GLHT, ILJT, __________, MLNT

  • Option : D
  • Explanation : 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.
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23. Find the missing letters in the following series.
WE, SG, PJ, LN, __________

  • Option : A
  • Explanation :
    First LetterSecond Letter
    W – 4 = SE + 2 = G
    S – 3 = PG + 3 = J
    P – 4 = LJ + 4 = N
    L – 3 = IN + 5 = S

    Thus (a) is the right answer.
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24. Find the missing letters and numbers in the following series.
C2A, E5D, G8G, I11J, __________

  • Option : A
  • Explanation : This series is just like the above series. However, the middle letter of each term is replaced by a number.
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25. 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.
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