Civil Services Prep

Prelims 2026 · CSAT / Logical Reasoning · Question 18

A pattern formed by two characters a and b is repeated more than once in the following string :<br/><br/>x b x a x a x x a x a x b a b<br/><br/>What is x x in the 7th and 8th positions from the left in the above string?<br/>

  1. aa
  2. ab
  3. ba
  4. bb

Answer

bb

Treat the 15-character string as 3 equal blocks of 5: (1–5), (6–10), (11–15). Matching positions across the three blocks gives the repeated pattern as ABBAB. Hence positions 7 and 8 are B and B.

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