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Saturday, 31 October

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JEE Main 2021 · MathsMultiple choiceSingle correctMediumConceptual

JEE Main 31 August 2021, Shift 1, Maths Q80

Question 80 of 90 in this shift, Maths question 20 of 30, Section A.

Let

*, ▯ \in \{\wedge, \vee\}

be such that the Boolean expression

(\mathrm{p}*\sim\mathrm{q})\Rightarrow(\mathrm{p}\,▯\,\mathrm{q})

is a tautology. Then :

(1) $* = \wedge,\ ▯ = \wedge$
(2) $* = \wedge,\ ▯ = \vee$ Official answer
(3) $* = \vee,\ ▯ = \wedge$
(4) $* = \vee,\ ▯ = \vee$

Official answer

Option 2

NTA final key.

Chapter: Mathematical Reasoning
Topic: No close match in our taxonomy
Idea tested: No close match in our taxonomy

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.