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JEE Main 202310 AprilMorning Shift
Exam
JEE Main
Year
2023
Date
10 April
Shift
Morning Shift
Subject
Mathematics
Chapter
Mathematical Reasoning

JEE Main 2023 · 10 April · Morning Shift · Mathematics · Mathematical Reasoning

The negation of the statement (p ∨ q) ∧ (q ∨ (~ r)) is

The negation of the statement (p∨q)∧\left(p ∨ q\right) ∧\left(q ∨ \left(~ r\right)\right) is

Options

  1. A(p∨r)∧( q)\left(p ∨ r\right) ∧ \left(~ q\right)
  2. B(( p)∨r))∧( q)\left(\left(~ p ) ∨ r\right)\right) ∧ \left(~ q\right)
  3. C(( p∨)( q))∨( r)\left(\left(~ p ∨\right)\left(~ q\right)\right) ∨ \left(~ r\right)
  4. D(( p)∨( q))∧( r)\left(\left(~ p\right) ∨ \left(~ q\right)\right) ∧ \left(~ r\right)

Correct answer

B. (( p)∨r))∧( q)\left(\left(~ p ) ∨ r\right)\right) ∧ \left(~ q\right)

Step-by-step solution

Given,

(p∨q)∧(q∨( r))\left(p ∨ q\right) ∧ \left(q ∨ \left(~ r\right)\right)

Now negation of above expression will be,

 ((p∨q)∧(q∨( r)))~ \left(\left(p ∨ q\right) ∧ \left(q ∨ \left(~ r\right)\right)\right)

= (p∨q)∨ (q∨( r)){as (A∧B)≡ A∨ B}= ~ \left(p ∨ q\right) ∨ ~ \left(q ∨ \left(~ r\right)\right)\left\{\text{as} ~ \left(A ∧ B\right) ≡ ~ A ∨ ~ B\right\}

=( p∧ q)∨( q∧r)= \left(~ p ∧ ~ q\right) ∨ \left(~ q ∧ r\right)

=( p∧ q)∨( q)∧( p∧ q)∨r= \left(~ p ∧ ~ q\right) ∨ \left(~ q\right) ∧ \left(~ p ∧ ~ q\right) ∨ r

= q∧[( p∨r)∧( q∨r)]= ~ q ∧ \left[\left(~ p ∨ r\right) ∧ \left(~ q ∨ r\right)\right]

=( q∧( p∨r))∧( q∧( q∨r))= \left(~ q ∧ \left(~ p ∨ r\right)\right) ∧ \left(~ q ∧ \left(~ q ∨ r\right)\right)

=( q∧( p∨r))∧ q= \left(~ q ∧ \left(~ p ∨ r\right)\right) ∧ ~ q

= \left(\left(~ p\right) ∨ r\right) ∧ \left(~ q\right)

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