Question

A series is given with some letters missing. Choose the set of letters which when sequentially placed shall complete it:
a__ dba __ bcad __ da __ cd}

• A. cbcdcba
• B. bccdbcab
• C. aabbccdd
• D. abcddcba

Hint:

Look for \textbf{mirror patterns} or \textbf{alphabet sequences} (like abcd, dcba) in such problems.

Answer 1

The Correct Option is D

Concept: Such questions are based on pattern continuation and symmetry in letter sequences. Step 1:Analyze the structure: \[ a__ dba __ bcad __ da __ cd \]
Step 2:Observe repeating patterns:

• Segments like dba, bcad, da, cd
• Suggest a structured progression using letters a, b, c, d

Step 3:Try option (D)} abcddcba: Insert sequentially: \[ a\underline{bc}dba\underline{dd}bcad\underline{cb}da\underline{a}cd \] This creates a consistent and symmetric pattern using all letters.
Step 4:Other options do not maintain proper order or symmetry.}
Step 5:Final Answer: \[ \text{abcddcba} \]