Select the letter that will replace the question mark (?) in the following series.
E, N, U, ?, C, D
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Z
Write each letter as its place in the alphabet and look at the gaps between neighbours; after Z the count continues from A.
E (5) to N (14) is 9 places ahead, and N (14) to U (21) is 7 places ahead, so the gaps are odd numbers falling by 2
The next gap is 5: \(21+5=26\), that is Z
Z to C is 3 places (A, B, C) and C to D is 1 place, so the last two letters fit the same rule
So the missing letter is Z.