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Saturday, 31 October

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JEE Main 2020 · MathsMultiple choiceSingle correctMediumApplication

JEE Main 2 September 2020, Shift 2, Maths Q70

Question 70 of 75 in this shift, Maths question 20 of 25.

Which of the following is a tautology ?

(1) $(p\to q)\wedge(q\to p)$
(2) $(\sim p)\wedge(p\vee q)\to q$ Official answer
(3) $(\sim q)\vee(p\wedge q)\to q$
(4) $(q\to p)\vee\sim(p\to q)$

Official answer

Option 2

NTA final key (Sep 2020).

Chapter: Relations and Functions
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.