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Each vowel in the word COMBINE 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 be fourth from the right in the new group of letters thus formed?
B
A
F
M
A
Identify only the relevant letters starting from the right end of the word to save time: map the last four letters instead of the whole word.
Identify only the relevant letters starting from the right end of the word to save time: map the last four letters instead of the whole word.
Mapping the letters
The word is C-O-M-B-I-N-E. Rule: Consonants (-1), Vowels (+1). C(cons)-1=B, O(vowel)+1=P, M(cons)-1=L, B(cons)-1=A, I(vowel)+1=J, N(cons)-1=M, E(vowel)+1=F. The new group is B-P-L-A-J-M-F.
Locating the fourth letter from the right
The new word is B P L A J M F. Counting from the right: 1st=F, 2nd=M, 3rd=J, 4th=A. Thus, the letter at the fourth position from the right is A.
Option A (B) is incorrect because B is the first letter from the left, not fourth from the right. Option C (F) is incorrect because F is the first letter from the right. Option D (M) is incorrect because M is the second letter from the right.
B is correct because following the rule (consonant-1, vowel+1) for the word COMBINE results in BPLAJMF, where the fourth letter from the right end is A.
When asked for a position from the right, count backward from the end of your transformed string or subtract the required index from the total length plus one (N-k+1).
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