Curioustab Logo Curioustab
Home » Logical Reasoning » Letter and Symbol Series

Alphabetical series reasoning puzzle: complete the sequence ELFA, GLHA, ILJA, ____, MLNA by identifying the letterwise patterns (first and third letters move by +2 in the alphabet while the second and fourth positions remain fixed) to find the next term.

Difficulty: Easy

Correct Answer: KLLA

Explanation:

We analyze each character position across the given terms.

  • Positions by term: ELFA, GLHA, ILJA, ? , MLNA.
  • 1st letter: E → G → I → (add +2 each step) → K → M.
  • 2nd letter: constant 'L' throughout.
  • 3rd letter: F → H → J → (add +2 each step) → L → N.
  • 4th letter: constant 'A' throughout.

Concept/Approach
Treat each column independently. Detect constant columns and arithmetic shifts (+2) in alphabetic indices for the others.
Step-by-Step calculation
1) First column: E(5) + 2 = G(7), +2 = I(9), +2 = K(11), +2 = M(13).2) Second column: always L ⇒ L.3) Third column: F(6) + 2 = H(8), +2 = J(10), +2 = L(12), +2 = N(14).4) Fourth column: always A ⇒ A.
Verification/Alternative
Rebuild the missing term from columns: K + L + L + A = KLLA. It fits neatly between ILJA and MLNA.
Common pitfalls
Mixing the +1 and +2 strides; overlooking that the 2nd and 4th characters are fixed constants.
Final Answer
KLLA
← Previous Question Next Question→

More Questions from Letter and Symbol Series

Discussion & Comments

No comments yet. Be the first to comment!
Join Discussion