2025 CSAT, all questions
UPSC Prelims 2025 · CSAT
Question 67: Basic Numeracy
What is the remainder when 9^3 + 9^4 + 9^5 + 9^6 + . . . + 9^100 is divided by 6 ?
a0
b1
c2
d3
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.