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GATE CSE 2025 Session 1 Q46: Rules for computing FIRST and FOLLOW sets

Question

Which of the following statement(s) is/are TRUE while computing First and Follow during top down parsing by a compiler?

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Answer: A, D (official GATE 2025 final answer key)

Concept used: FIRST sets may contain ϵ\epsilon; FOLLOW sets never do, but FOLLOW of the start symbol always contains the right end marker.

First step: Recall the base rules: A→ϵA \to \epsilon puts ϵ\epsilon in FIRST(A), and the right end marker is placed in FOLLOW(S) before anything else.

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Source: official GATE 2025 Session 1 CS question paper and final answer key, organised by IIT Roorkee. Question paper · Answer key

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