GateQA — Free GATE CS Previous Year Questions & Mock Tests

GateQA is a free GATE CS preparation platform with 3,500+ previous-year questions (1987–2026), 36,000+ aptitude questions, full-length year-wise mock tests, a built-in GATE calculator, performance analytics, and full offline support.

Practice questions from Operating Systems, Algorithms, DBMS, Computer Networks, Theory of Computation, Discrete Mathematics, Compiler Design, Digital Logic, Computer Organization, Software Engineering, and Engineering Mathematics.

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GateQA — Free GATE CS Preparation Platform

GateQA is a free GATE CS preparation platform featuring 3,500+ previous-year questions (1987–2026), 36,000+ aptitude questions, subject-wise and year-wise mock tests, performance analytics, and full offline support. Practice Operating Systems, Algorithms, DBMS, Computer Networks, Theory of Computation, Discrete Mathematics, Compiler Design, Digital Logic, and more.

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Discrete Mathematics

GATE CSE 2015 Set 3 | Question: 2

Subject: Discrete Mathematics
Paper: 2015 Set 3
Let $\#$ be the binary operator defined as $X\#Y = X'+Y'$ where $X$ and $Y$ are Boolean variables. Consider the following two statements. $(S_1)$ $(P\#Q)\#R = P\#(Q\#R)$ $(S_2)$ $…
Answer: B

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