In given series, some letters are missing, these are given in options in that order. Select the option to complete the series in a pattern:
ba_ba_baab_

a. baba
b. aaaa
c. bbbb
d. baab

1. A

   baba

2. B

   aaaa

3. C

   bbbb

4. D

   baab

Appeared in: RRB Staff Nurse Mumbai-2015

Explanation

• The problem requires finding a repeating pattern in a sequence of letters.
• Assuming the completed series is 12 characters long, we can test for repeating blocks of letters.
• Filling the blanks with 'aaaa' creates the series 'b a a b a a b a a b a a'.
• This series can be broken down into four identical, repeating blocks of '(baa)'.
• This consistent repetition confirms that 'aaaa' is the correct sequence to complete the series.

Why Other Options Were Wrong

• Option A: Inserting 'baba' into the blanks creates the sequence 'babbaabaab-ba', which does not form any logical or repeating pattern.
• Option C: Using 'bbbb' to fill the blanks results in the sequence 'babbabb-aabbb', which has no consistent repeating block.
• Option D: The sequence 'baab' creates 'babbaabaab-ab', which does not follow a consistent, repeating pattern.

Related Visual

• Visual 1: Infographic - An infographic showing the series with the blanks highlighted. A second line shows the blanks being filled with the correct letters 'a', 'a', 'a', 'a'. A third line shows the completed series grouped into four repeating blocks of '(baa)' to visually demonstrate the pattern.

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain This question tests the ability to identify and complete repeating patterns in a letter series, a common type of logical reasoning problem as background academic context rather than a clinical decision trigger.
• This is a logical reasoning question designed to assess problem-solving and pattern recognition skills.
• These skills are foundational for nurses who must recognize patterns in patient symptoms, vital signs, and lab data to make sound clinical judgments.
• While this specific puzzle has no direct clinical application, the underlying cognitive ability is crucial in nursing practice.

How to Approach the Question

• First, count the number of given letters and the number of letters in the options. This gives you the total length of the completed series (8 + 4 = 12).
• Look for potential repeating blocks. Since the total length is 12, the pattern could be 2, 3, 4, or 6 letters long.
• Systematically substitute the letters from each option into the blanks.
• After substituting, examine the resulting series to see if a consistent, repeating pattern emerges.
• The option that creates a clear and simple repeating pattern is the correct answer. In this case, 'aaaa' creates the pattern '(baa)' repeated four times.
• Eliminate options that result in a jumbled sequence with no logical repetition.

Concept Tested & Keywords

• Concept Tested: This question tests the ability to identify and complete repeating patterns in a letter series, a common type of logical reasoning problem.
• Stem keywords: series, missing letters, pattern, ba_ba_baab_
• Lead-in keywords: complete the series

Question ID

QbvmHvCnOtaIkZHArbQC9Z

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