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Refer to the following letter, symbol series and answer the question that follows. Counting to be done from left to right only.
How many such letter are there, each of which is immediately preceded by a letter and also immediately followed by a symbol?
6
5
4
3
4
Scan the sequence for the triplet pattern [Letter, Letter, Symbol]. Ignore everything else and count these three-character sequences from left to right.
Scan the sequence for the triplet pattern [Letter, Letter, Symbol]. Ignore everything else and count these three-character sequences from left to right.
Analyze the condition
We need to identify sequences of 3 characters: [Letter] [Letter] [Symbol]. The letter must be preceded by a letter and followed by a symbol. This means we are looking for the pattern: (Letter)(Letter)(Symbol).
Scan the sequence
Series: T % KL € & € G R Y @ A W # Y © RB * OY. 1) K, L, € (Yes: Letter, Letter, Symbol); 2) R, Y, @ (Yes: Letter, Letter, Symbol); 3) A, W, # (Yes: Letter, Letter, Symbol); 4) R, B, * (Yes: Letter, Letter, Symbol).
Final Verification
Let's re-check: T(L), %(S), K(L), L(L), €(S) → K,L,€ (Match 1). G(L), R(L), Y(L) → No. R(L), Y(L), @(S) → R,Y,@ (Match 2). A(L), W(L), #(S) → A,W,# (Match 3). R(L), B(L), (S) → R,B, (Match 4). Total = 4.
A: 6 is incorrect because there are only 4 valid occurrences; B: 5 is incorrect as the sequence does not contain a fifth valid triplet; D: 3 is incorrect as it underestimates the count by missing one valid occurrence.
C is correct because a rigorous scan of the provided series yields exactly four instances of the pattern (Letter-Letter-Symbol): (K,L,€), (R,Y,@), (A,W,#), and (R,B,*).
In alphanumeric series questions, always mark the letters as L and symbols as S to quickly visualize the required pattern string.