Mathematical Reasoning - Letter Series

11. AB, DE, GH, ..., MN

  • Option : B
  • Explanation : After every pair, one letter is skipped.
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12. AA, CE, EI, GO, ...

  • Option : A
  • Explanation : The first letters of all pairs given in the question follow a sequence of A + 2 = C, C + 2 = E and so on. The second letters are vowels.
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13. ABD, CDF, ..., GHJ, IJL

  • Option : A
  • Explanation : The first letter of each triplet follows a sequence of A, C, E, G, I and so on. The second letter of each triplet follows a sequence of B, D, F, H, J and so on, and the third letter forms a sequence of D, F, H, J, L and so on.
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14. CKZ, DLY, ... , FNW, GOV

  • Option : A
  • Explanation : The first letters form a series of C, D, E, F, G and so on. The second letters form a series of K, L, M, N, O and so on. The third letters form a series of Z, Y, X, W, V and so on.
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15. NAB, OEC, PIE, QOG, ...

  • Option : D
  • Explanation : The first letters form a series of N, O, P, Q, R and so on. The second letters form a vowel series, and the third letters form prime number series according to their number position.
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