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Refer to the following letter series and answer the question that follows. Counting to be done from left to right. (Left) B A E F I O U P E A R T I O N E S T U D E N T (Right) 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
3
Scan for vowels (A, E, I, O, U) first, then quickly check the immediate neighbors to ensure both are consonants; skip sequences of two vowels.
Scan for vowels (A, E, I, O, U) first, then quickly check the immediate neighbors to ensure both are consonants; skip sequences of two vowels.
Analyze the sequence
The given series is: B, A, E, F, I, O, U, P, E, A, R, T, I, O, N, E, S, T, U, D, E, N, T. We need to identify vowels (A, E, I, O, U) that have a consonant on both immediate sides (C-V-C pattern).
Evaluate candidates
Checking each vowel: A(B-E, No), E(A-F, No), I(F-O, No), O(I-U, No), U(O-P, Yes - O is a vowel, but wait, check neighbors: O-U-P тЖТ Consonant-Vowel-Consonant is F-I-O (No), I-O-U (No), U-P-E (No). Let's re-verify carefully: B(C) A(V) E(V) F(C) I(V) O(V) U(V) P(C) E(V) A(V) R(C) T(C) I(V) O(V) N(C) E(V) S(C) T(C) U(V) D(C) E(V) N(C) T(C). Pattern C-V-C: 1) F-I-O (No, I is surrounded by F and O), 2) P-E-A (No), 3) R-T-I (No), 4) N-E-S (Yes, N is C, E is V, S is C), 5) D-E-N (No), 6) T-U-D (Yes, T is C, U is V, D is C).
Verify final count
The two instances fitting the Consonant-Vowel-Consonant (C-V-C) pattern are: 1) N-E-S (N is consonant, E is vowel, S is consonant) and 2) T-U-D (T is consonant, U is vowel, D is consonant).
A is incorrect as there are 2, not 1; C is incorrect as there are only 2, not 3; D is incorrect as there are only 2, not 4.
B is correct because the sequence contains exactly two vowels (E in NES and U in TUD) that are immediately preceded and followed by consonants.
When counting patterns in a long string, always write the sequence down and mark each vowel as V and each consonant as C to visually isolate the C-V-C triplets quickly.