2025 CSAT, all questions
UPSC Prelims 2025 · CSAT
Question 60: Logical Reasoning and Mental Ability
What is X in the sequence 1, 3, 6, 11, 18, X, 42 ?
a26
b27
c29
d30
UPSC's 2025 key was reported published in May 2026, but no file was found on upsc.gov.in or in the Wayback Machine. The 2025 papers can be browsed, not scored.
Source: UPSC, Civil Services (Preliminary) Examination 2025, General Studies Paper II (CSAT), Series A. The paper on upsc.gov.in.