Understanding the Series Reversal Problem

The problem asks us to manipulate a given series of characters and then count specific elements based on their neighbours in the modified series. First, we need to identify the second half of the series and reverse it. Then, we analyze the new arrangement to find letters that have a letter immediately before them and a number immediately after them.

Step 1: Analyze the Original Series

The given series is: 9$YX8N6OLBUJZT(a)1QFD%

Let's count the characters to find the halfway point.

• The total number of characters in the series is 20.
• The first half consists of the first 10 characters.
• The second half consists of the next 10 characters (from the 11th to the 20th).

Original Series:

First Half: 9$YX8N6OLB

Second Half: UJZT(a)1QFD%

Step 2: Reverse the Second Half

We need to reverse the order of characters in the second half UJZT(a)1QFD%.

Reversed Second Half: %DFQ1(a)TZJU

Step 3: Form the New Series

Now, we combine the original first half with the reversed second half.

New Series = First Half + Reversed Second Half

New Series: 9$YX8N6OLB%DFQ1(a)TZJU

Step 4: Identify Letters Preceded by a Letter and Succeeded by a Number

We need to scan the new series from left to right and find letters that fit the pattern: Letter - Target Letter - Number.

Let's go through the new series: 9$YX8N6OLB%DFQ1(a)TZJU

• 9: Number. Not a letter.
• $: Symbol. Not a letter.
• Y: Letter. Preceded by $ (Symbol), Succeeded by X (Letter). Does not fit the pattern.
• X: Letter. Preceded by Y (Letter), Succeeded by 8 (Number). Fits the pattern! (Y - X - 8)
• 8: Number. Not a letter.
• N: Letter. Preceded by 8 (Number), Succeeded by 6 (Number). Preceded by Number, not Letter. Does not fit.
• 6: Number. Not a letter.
• O: Letter. Preceded by 6 (Number), Succeeded by L (Letter). Preceded by Number, not Letter. Does not fit.
• L: Letter. Preceded by O (Letter), Succeeded by B (Letter). Succeeded by Letter, not Number. Does not fit.
• B: Letter. Preceded by L (Letter), Succeeded by % (Symbol). Succeeded by Symbol, not Number. Does not fit.
• %: Symbol. Not a letter.
• D: Letter. Preceded by % (Symbol), Succeeded by F (Letter). Preceded by Symbol, not Letter. Does not fit.
• F: Letter. Preceded by D (Letter), Succeeded by Q (Letter). Succeeded by Letter, not Number. Does not fit.
• Q: Letter. Preceded by F (Letter), Succeeded by 1 (Number). Fits the pattern! (F - Q - 1)
• 1: Number. Not a letter.
• (: Symbol. Not a letter.
• a: Letter. Preceded by ( (Symbol), Succeeded by ) (Symbol). Preceded and Succeeded by Symbols. Does not fit.
• ): Symbol. Not a letter.
• T: Letter. Preceded by ) (Symbol), Succeeded by Z (Letter). Preceded by Symbol. Does not fit.
• Z: Letter. Preceded by T (Letter), Succeeded by J (Letter). Succeeded by Letter, not Number. Does not fit.
• J: Letter. Preceded by Z (Letter), Succeeded by U (Letter). Succeeded by Letter, not Number. Does not fit.
• U: Letter. Preceded by J (Letter). End of series. Cannot be succeeded by a number within the series. Does not fit.

The letters that fit the criteria (preceded by a letter and succeeded by a number) are X and Q.

Step 5: Count the Identified Letters

We found 2 letters that satisfy the condition.

Therefore, there are 2 such letters in the new series.

Revision Table for Series and Pattern Questions

Reviewing the concepts involved in solving character series and pattern-based reasoning questions is crucial for exam preparation.

• Understand the structure of the given series (letters, numbers, symbols).
• Identify the specific operation required (e.g., reversal, shifting, deletion).
• Carefully perform the operation on the correct part of the series.
• Form the new series accurately.
• Understand the pattern or condition being asked for (e.g., preceded by, succeeded by, combination of types).
• Systematically scan the new series, checking each element against the condition.
• Keep track of the count of elements that meet the condition.

Additional Information on Character Series Reasoning

Character series reasoning problems are common in various competitive exams. They test your ability to follow instructions, manipulate sequences, and identify patterns based on relative positions of elements.

• Types of Elements: Series can contain letters (uppercase/lowercase), numbers, symbols.
• Operations: Common operations include reversal of a section, interchanging elements, deleting elements, inserting elements, or applying a rule based on position (e.g., every third element).
• Conditions: Conditions usually involve checking the type of character immediately before or after a specific element, or characters at certain positions.
• Strategy: Breaking down the problem into smaller steps (understand series, perform operation, check condition, count) helps avoid errors. Writing down the modified series is essential for accurate analysis.