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Refer to the following number and symbol series and answer the question that follows. (Counting to be done from left to right only.)
How many such symbols are there, each of which is immediately preceded by and also immediately followed by a number?
Three
Two
One
Four
Three
Scan the series specifically for symbols (non-alphanumeric) and check if the characters immediately to the left and right are digits (0-9).
Scan the series specifically for symbols (non-alphanumeric) and check if the characters immediately to the left and right are digits (0-9).
Analyze Sequence
Given sequence: 2, @, 4, +, =, 3, 1, #, 3, @, $, 9, 8, *, 9, 4, 2, 8, 7, 6, 5. The rule requires a symbol flanked by digits on both sides (Number-Symbol-Number).
Locate Candidates
Scanning from left to right: 1) '2 @ 4' (Valid: 2 and 4 are numbers), 2) '+', '=', '1 # 3' (Valid: 1 and 3 are numbers), 3) '@', '$', '9 8 * 9' (Valid: 8 and 9 are numbers).
Final Verification
Matches are: (@ in 2@4), (# in 1#3), (* in 8*9). Total count = 3.
B: Two is incorrect as we found three valid patterns. C: One is incorrect as it underestimates the count. D: Four is incorrect as the sequence contains only three such valid instances.
A is correct because there are exactly three symbols (@, #, *) that are immediately preceded and followed by a number.
In alphanumeric series questions, always list the series clearly and mark the target condition (e.g., Number-Symbol-Number) to avoid skipping elements or double-counting.
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