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Refer to the given number, symbol series and answer the question that follows. Counting to be done from left to right only.
How many such numbers are there each of which is immediately preceded by a symbol and also immediately followed by another symbol?
4
5
6
7
5
Scan the sequence for numeric characters only, then check immediately adjacent characters on both sides to verify if both are symbols.
Scan the sequence for numeric characters only, then check immediately adjacent characters on both sides to verify if both are symbols.
Analyze the Series
Given sequence: 2, 3, , 7, 5, &, 6, \%, 3, , #, 9, @, ), 7, +, 6,?, >,?, 4, 7, 5, $.
Apply Pattern Constraint
Constraint: Number immediately preceded by a symbol and followed by a symbol (S-N-S). Checking each number: 3(),7(&), 5(&6), 6(%3), 3(#), 9(#@), 7()), 6(? >), 4(? 7), 7(4 5), 5(7 ).
Identify Valid Triplets
Valid matches: (7&), (&6\%), (\%3), (#9@), ()7+). Checking others: 7 has , &; 5 has 7, &; 6 has &, \%; 3 has \%, ; 9 has , #; 7 has ), +; 4 has?,?; 7 has 4, 5; 5 has 7, .
A: 4 is incorrect as it misses one valid triplet found by manual count. C: 6 is incorrect as it overcounts by including triplets that don't strictly follow the S-N-S rule. D: 7 is incorrect as it significantly overestimates the matches present.
B is correct because there are exactly 5 occurrences of a number surrounded by symbols: 7&, &6\%, \%3, #9@, and )7+.
In alphanumeric series, always use a pencil to mark the triplets as you find them to avoid double-counting or skipping items.
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