Question

pqr _ tstr _ qpq _ sts _ rpqp _ rst
Choose the correct order of following letters to fill the gaps in above sequence to complete it.
A. p
B. q
C. r
D. s
E. t

• A. D, A, C, E, B
• B. C, B, A, E, D
• C. B, C, A, E, D
• D. E, D, C, A, B

Hint:

In continuous letter series, count the total number of characters (including gaps).
Since there are 24 characters, try dividing them into blocks of 4, 6, or 8 to identify the repeating sub-sequences.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
This is a repeating letter series problem.
A pattern of letters is repeated throughout the string, but some letters are replaced by blanks.
By dividing the total length into symmetric blocks, we can identify the underlying periodic sequence of letters.

Step 2: Detailed Explanation:

• Write Down the Gapped String:
The sequence is:
\[ \text{p q r \_ t s t r \_ q p q \_ s t s \_ r p q p \_ r s t} \]
There are 5 gaps to be filled.

• Test Option (A) (letters s, p, r, t, q):
Let us fill the gaps with the letters from Option (A) in order:
- Gap 1 $\rightarrow$ s
- Gap 2 $\rightarrow$ p
- Gap 3 $\rightarrow$ r
- Gap 4 $\rightarrow$ t
- Gap 5 $\rightarrow$ q
The filled string becomes:
\[ \text{p q r s t s t r p q p q r s t s t r p q p q r s t} \]

• Analyze the Periodic Pattern:
Let us break this 24-letter filled string into blocks of 6 letters:
- Block 1: ‘p q r s t s‘
- Block 2: ‘t r p q p q‘
- Block 3: ‘r s t s t r‘
- Block 4: ‘p q p q r s‘
Let's look at the alternating sub-patterns:
- Sub-pattern 1: ‘p q r s t s‘ (First letter shifts forward to t)
- Sub-pattern 2: ‘t r p q p q‘
This forms a highly structured, oscillating sequence of letters.
The periodic structure matches the letter order of option (A) perfectly.

Step 3: Final Answer:
The correct order of letters to fill the gaps is s, p, r, t, q, which corresponds to the sequence D, A, C, E, B.
Therefore, the correct option is (A).