Q45. Consider the sequence ABC_ _ABC_DABBCD_ABCD that follows a certain pattern.
Which of the following completes the sequence?
Detailed Solution
The given sequence is ABC_ _ABC_DABBCD_ABCD. Let's analyze the pattern by dividing the sequence into blocks of 4 or 5 characters. The provided solution suggests a cyclic shift pattern when divided into blocks of 4, where the last character of a block moves to the first position of the next block.
If we assume the complete sequence follows the pattern: ABCD, DABC, CDAB, BCDA, ABCD. Let's map this to the given sequence with blanks: 1. ABC_ -> ABCD (Blank is D) 2. _ABC -> DABC (Blank is D) 3.
_DAB -> CDAB (Blank is C) 4. BCD_ -> BCDA (Blank is A) 5. ABCD -> ABCD (No blank) So, the missing letters are D, D, C, A. This matches option (D). The pattern is a cyclic shift of the letters A, B, C, D.
This question tests pattern recognition in sequences, a common logical reasoning topic in CSAT.
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