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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 K M P A E D O U F I G A B G A N R S H X (Right) How many such consonants are there, each of which is immediately preceded by a consonant and also immediately followed by a vowel?
1
2
3
4
2
Scan for sequences of Consonant-Consonant-Vowel (C-C-V) triplets within the given series to quickly pinpoint the target.
Scan for sequences of Consonant-Consonant-Vowel (C-C-V) triplets within the given series to quickly pinpoint the target.
Define the target structure
We need a Consonant (C) immediately preceded by a Consonant (C) and followed by a Vowel (V). The structure is C-C-V.
Evaluate the sequence
The series is: B(C) K(C) M(C) P(C) A(V) E(V) D(C) O(V) U(V) F(C) I(V) G(C) A(V) B(C) G(C) A(V) N(C) R(C) S(C) H(C) X(C). Checking C-C-V triplets: B-K-M (No), K-M-P (No), M-P-A (Yes, P is preceded by M and followed by A), D-O-U (No), F-I-G (No), G-A-B (No), B-G-A (Yes, G is preceded by B and followed by A), N-R-S (No), R-S-H (No), S-H-X (No).
Final Count
The sequence contains two instances: 1) M-P-A where P is the consonant, and 2) B-G-A where G is the consonant. Re-evaluating the sequence again carefully: B, K, M, P, A, E, D, O, U, F, I, G, A, B, G, A, N, R, S, H, X. M-P-A is one. B-G-A is two. Wait, checking the string again: B-K-M-P-A... M,P,A is C-C-V. B-G-A: B is C, G is C, A is V. So there are two instances. Let me re-verify. Series: B K M P A E D O U F I G A B G A N R S H X. Let's list: B(C)-K(C)-M(C)-P(C)-A(V)-E(V)-D(C)-O(V)-U(V)-F(C)-I(V)-G(C)-A(V)-B(C)-G(C)-A(V)-N(C)-R(C)-S(C)-H(C)-X(C). C-C-V patterns: 1: M-P-A, 2: B-G-A. The count is 2.
A: Incorrect as the count is 2. C: Incorrect as there are not 3 instances. D: Incorrect as there are not 4 instances.
B is correct because the sequence contains two instances (M-P-A and B-G-A) that satisfy the condition of a consonant preceded by a consonant and followed by a vowel.
In alphanumeric series, always rewrite the sequence clearly on your scratchpad and mark vowels and consonants above/below them before scanning for the required triplet.
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