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Complete the pattern in the series CMM, EOO, GQQ, ____, KUU by tracking three independent alphabetic progressions (each moving forward by +2 letters) to determine the missing triple.

Difficulty: Easy

Correct Answer: ISS

Explanation:

Observe three synchronized +2 sequences.

  • 1st letters: C → E → G → ( +2 ) → I → K.
  • 2nd letters: M → O → Q → ( +2 ) → S → U.
  • 3rd letters: M → O → Q → ( +2 ) → S → U.

Concept/Approach
Treat each position as an arithmetic progression on alphabet indices: A=1, B=2, …, Z=26.
Step-by-Step calculation
1) First column: C(3)+2=E(5), +2=G(7), +2=I(9).2) Second column: M(13)+2=O(15), +2=Q(17), +2=S(19).3) Third column: same as second ⇒ next is S.
Verification/Alternative
Compose the missing item: I + S + S = ISS. The final given term KUU continues the +2 stride.
Common pitfalls
Accidentally stepping by +1; confusing the mirrored second and third positions.
Final Answer
ISS
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