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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 symbols are there each of which is immediately preceded by an odd number but NOT immediately followed by an even number?
Four
Two
One
Three
One
Scan for symbols one by one, checking if the preceding character is odd (1, 3, 5, 7, 9) and the following character is NOT even (meaning the following character must be a symbol or odd).
Scan for symbols one by one, checking if the preceding character is odd (1, 3, 5, 7, 9) and the following character is NOT even (meaning the following character must be a symbol or odd).
Identify Symbols
List all symbols in the sequence: #, *, &, &, ╬й, %, @, $, ┬г.
Apply Conditions
Condition 1: Preceded by an Odd Number (1, 3, 5, 7, 9). Condition 2: NOT followed by an Even Number (Must be followed by Symbol or Odd).
Verification
1: '#' (Preceded by 6-Even). 2: '*' (Preceded by 1-Odd, followed by 8-Even). 3: '&' (Preceded by 8-Even). 4: '&' (Preceded by 7-Odd, followed by 5-Odd). This is the only valid match.
A: Four is incorrect as only one valid match exists. B: Two is incorrect because the other symbols fail the preceding or following criteria. D: Three is incorrect because the criteria are strict and only the second '&' satisfies them.
C is correct because the only symbol preceded by an odd number and not followed by an even number is the second '&' (7 & 5).
In alphanumeric series questions, always list the criteria first and verify them one symbol at a time to avoid skipping elements or double counting.
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