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In the word OPTICAL, each vowel is changed to the letter immediately succeeding it in the English alphabetical order and each consonant is changed to the letter immediately preceding it in the English alphabetical order. Which of the following letters is repeated twice in the new group of letters thus formed?
B
P
O
K
B
Identify vowels (A, E, I, O, U) and consonants in the word first. Apply +1 to each vowel and -1 to each consonant, then look for any letter repeated twice.
Identify vowels (A, E, I, O, U) and consonants in the word first. Apply +1 to each vowel and -1 to each consonant, then look for any letter repeated twice.
Step 1: Identify Vowels and Consonants
In the word OPTICAL, the vowels are O, I, A and the consonants are P, T, C, L.
Step 2: Apply Transformation Rules
Vowels (+1): O тЖТ P, I тЖТ J, A тЖТ B. Consonants (-1): P тЖТ O, T тЖТ S, C тЖТ B, L тЖТ K.
Step 3: Form New Group and Check Repetition
The new group of letters is P, O, S, J, B, B, K. The letter B is repeated twice.
B: Letter P appears only once. C: Letter O appears only once. D: Letter K appears only once.
A is correct because the transformed group of letters for OPTICAL is POSJBBK, where the letter B is repeated twice.
Always list out letter-by-letter transformations clearly to avoid missing duplicated letters in coding-decoding and series problems.
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