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Refer to the following letter series and answer the question that follows. Counting to be done from left to right only.
How many such vowels are there, each of which is immediately preceded by a consonant and also immediately followed by a consonant?
1
2
3
4
2
Scan only the vowels (A, E, I, O, U) and check the immediate left and right neighbors; ignore all other letters.
Scan only the vowels (A, E, I, O, U) and check the immediate left and right neighbors; ignore all other letters.
Analyze the series
The given series is: A(1), E(2), B(3), I(4), O(5), U(6), C(7), D(8), E(9), F(10), G(11), A(12), I(13), O(14), U(15), H(16), J(17), K(18), E(19), I(20), O(21). Vowels are A, E, I, O, U.
Examine each vowel for Consonant-Vowel-Consonant pattern
Checking each vowel: E(2) is between A, B (Invalid); I(4) is between B, O (Invalid); O(5) is between I, U (Invalid); U(6) is between O, C (Invalid); E(9) is between D, F (Valid: Consonant D, Vowel E, Consonant F); A(12) is between G, I (Invalid); I(13) is between A, O (Invalid); O(14) is between I, U (Invalid); U(15) is between O, H (Invalid); E(19) is between K, I (Invalid); I(20) is between E, O (Invalid).
Final tally
Only the E at index 9 is preceded by D (consonant) and followed by F (consonant). Total count = 1.
B: 2 is incorrect because there is only one instance of the pattern. C: 3 is incorrect as the count does not reach 3. D: 4 is incorrect as the count does not reach 4.
A is correct because the vowel E at the 9th position is the only one surrounded by consonants (D and F) in the given sequence.
When counting specific patterns in a long string, mark the targets (vowels) first, then verify only their immediate neighbors to avoid missing any or overcounting.
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