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UPSC Prelims 2024CSATLogical ReasoningSeries Completion

Q24. 24. Consider the sequence A_BCD_BBCDABC_DABC_D that follows a certain pattern.

Which one of the following completes the sequence?

A. B, A, D, C
B. B, A, C, D
C. A, A, C, D✓ Correct
D. A, A, D, C

Detailed Solution

✓ Correct Answer: Option C

Let's analyze the given sequence: A_BCD_BBCDABC_DABC_D. The pattern appears to be a repeating block where one letter is duplicated in each subsequent block. Let's assume the base block is ABCD.

The pattern seems to be: 1. A A BCD (A is duplicated) 2. A B BCD (B is duplicated) 3. A B C C D (C is duplicated) 4. A B C D D (D is duplicated) Applying this pattern to the given sequence: - For A_BCD, the first block should be A A BCD.

So, the first blank is A. - For _BBCD, the second block should be A B BCD. So, the second blank is A. - For ABC_D, the third block should be A B C C D. So, the third blank is C. - For ABC_D, the fourth block should be A B C D D.

So, the fourth blank is D. Therefore, the missing letters are A, A, C, D. This is a complex series completion problem requiring careful pattern recognition.

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