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Refer to the following letter, number and symbol series and answer the question that follows.
How many such symbols are there that are immediately preceded by a letter and immediately followed by a number?
One
Two
Four
Three
One
Scan only for symbol positions first, then verify if the character to the immediate left is a letter and the character to the immediate right is a number.
Scan only for symbol positions first, then verify if the character to the immediate left is a letter and the character to the immediate right is a number.
Analyze the series composition
The series is: 6, 2, 8, #, 7, , 2, L, %, 9, 3, 3, , /, +, H, 2, , S, P, #, H. \text{Symbols in the series are}: #, \, \%, \, /, +, , #.
Evaluate symbol patterns
We need patterns in the format: (Letter) тЖТ (Symbol) тЖТ (Number). Checking each symbol: 1) # (preceded by 8, not letter), 2) \ (preceded by 7, not letter), 3) % (preceded by L, followed by 9. Matches: L%9), 4) \ (preceded by 3, not letter), 5) / (preceded by , not letter), 6) + (preceded by /, not letter), 7) $ (preceded by 2, not letter), 8) # (preceded by P, followed by H, not a number).
Count valid instances
Only the pattern L%9 satisfies the condition: L (letter), % (symbol), 9 (number). All other symbols fail either the left-side (letter) or right-side (number) constraint.
B: Incorrect, as there is only one such symbol, not two. C: Incorrect, as there are not four such symbols. D: Incorrect, as there are not three such symbols.
A is correct because L%9 is the only occurrence where a symbol is immediately preceded by a letter and followed by a number.
In alphanumeric series questions, never read the whole sequence linearly. Instead, filter by the middle constraint (in this case, symbols) first, then verify the surrounding constraints.
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