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Each vowel in the word PANDEMIC is changed to the letter immediately following 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 will appear exactly twice in the new group of letters thus formed?
M
B
C
O
B
Apply the rule group-wise: vowels (+1) and consonants (-1). Quickly list the transformed letters and tally frequencies to spot the duplicate.
Apply the rule group-wise: vowels (+1) and consonants (-1). Quickly list the transformed letters and tally frequencies to spot the duplicate.
Mapping the Word PANDEMIC
Word: P(C), A(V), N(C), D(C), E(V), M(C), I(V), C(C). Rule: Vowel+1, Consonant-1.
Transforming each letter
P(-1)=O, A(+1)=B, N(-1)=M, D(-1)=C, E(+1)=F, M(-1)=L, I(+1)=J, C(-1)=B. Resulting string: O, B, M, C, F, L, J, B.
Frequency analysis
Counting the occurrences: B appears twice (at index 2 and 8). O, M, C, F, L, J each appear exactly once.
A: M appears only once in the final sequence. C: C appears only once in the final sequence. D: O appears only once in the final sequence.
B is correct because the letter B appears at the second and eighth position in the transformed sequence O-B-M-C-F-L-J-B.
Always list the transformed sequence clearly. If you are pressed for time, quickly identify all consonants first, then check vowels, to avoid missing duplicates.
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