2025 CSAT, all questions

UPSC Prelims 2025 · CSAT

Question 27: Basic Numeracy

Let both p and k be prime numbers such that (p^2 + k) is also a prime number less than 30. What is the number of possible values of k ?

a4
b5
c6
d7

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.

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Source: UPSC, Civil Services (Preliminary) Examination 2025, General Studies Paper II (CSAT), Series A. The paper on upsc.gov.in.