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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.
(Left) K O * © I % X © V € £ # U B $ D * # L © A U (Right)
How many such symbol are there, each of which is immediately preceded by a letter and also immediately followed by a symbol?
3
5
4
2
3
Quick Trick: Scan the series for sequences matching the pattern [Letter] -> [Symbol] -> [Symbol]. Ignore symbols preceded by numbers or other symbols.
Scan the series for sequences matching the pattern [Letter] -> [Symbol] -> [Symbol]. Ignore symbols preceded by numbers or other symbols.
Understand the Target Condition
We are looking for a symbol that satisfies two conditions: 1) Immediately preceded by a Letter, and 2) Immediately followed by a Symbol. This creates the exact sequence pattern: [Letter] -> [Symbol] -> [Symbol].
Scan the Series Left to Right
Let us check each symbol in the series: K O * © I % X © V € £ # U B $ D * # L © A U.
Count the Valid Occurrences
The valid triplets found are O * ©, V € £, and D * #. The total count is 3.
B: Incorrect, 5 counts include sequences where the symbol is followed by a letter instead of a symbol. C: Incorrect, 4 overcounts sequences like B $ D. D: Incorrect, 2 misses one of the valid triplets.
A is correct because exactly 3 symbols satisfy the pattern [Letter] -> [Symbol] -> [Symbol] (O * ©, V € £, and D * #).
When solving preceded/followed questions, translate the verbal condition into a 3-character pattern template (e.g., Letter-Symbol-Symbol) before scanning to avoid counting errors.