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Refer to the following number, symbol series and answer the question. Counting to be done from left to right only. All numbers are single-digit numbers.
How many such symbols are there each of which is immediately preceded by another symbol and also immediately followed by a number?
None
Two
One
Three
None
Scan the series for 'Symbol-Symbol-Number' triplets. A symbol must be preceded by a symbol AND followed by a number.
Scan the series for 'Symbol-Symbol-Number' triplets. A symbol must be preceded by a symbol AND followed by a number.
Analyze the pattern
The requirement is a triplet: Symbol (S) followed by another Symbol (S) followed by a Number (N). Sequence: S → S → N.
Mapping the sequence
Series: 4, 3, 1, 2, , 9, &, 2,?, 4, @, 1, 9, *, 3, 7, 3, @, &, <, \%. \text{Symbols present}: , &,?, @, *, @, &, <, %.
Verification of triplets
Scanning symbols: '$' is followed by '9'(N), '&' is followed by '2'(N), '?' is followed by '4'(N), '@' is followed by '1'(N), '*' is followed by '3'(N), '@' is followed by '&'(S), '&' is followed by '<'(S). No instance exists where a symbol is immediately followed by another symbol AND that second symbol is followed by a number.
B: Incorrect, no such pattern exists. C: Incorrect, the count is zero. D: Incorrect, the count is zero.
A is correct because there are no instances in the series where a symbol is immediately preceded by another symbol and simultaneously followed by a number.
In alphanumeric series, always write the criteria (S-S-N) and use a pencil to underline matches to avoid missing elements or miscounting.