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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Mathematics
Chapter
Mathematical Reasoning

NTA Abhyas 2020 · Mathematics · Mathematical Reasoning

The statement (p ⇔ q) is not equivalent to

The statement $ \left(p ⇔ q\right) is not equivalent to

Options

  1. Ap⇔qp ⇔ q
  2. B(p∧q)∨(q∧p)\left(p ∧ q\right) ∨ \left(q ∧ p\right)
  3. C(p∨q)∧(p∨q)\left(p ∨ q\right) ∧ \left( p ∨ q\right)
  4. D(p∨q)⇒(p∧q)\left(p ∨ q\right) ⇒ \left(p ∧ q\right)

Correct answer

D. (p∨q)⇒(p∧q)\left(p ∨ q\right) ⇒ \left(p ∧ q\right)

Step-by-step solution

Option (A)\left(A\right) is theorem hence \left(A\right)isequivalentto(p⇔q)is equivalent to \left(p ⇔ q\right)
Option \left( B\right) \left( p ⇔ q\right) means only pp or only qq
Which is same as \left(p ∧ q\right) ∨ \left( q ∧ p\right)
Option \left(C\right) \left( p ∨ q\right) ∧ \left( pv q\right)
≡(p∨q)≡ \left( p ∨ q\right) ∧ \left( \left(p ∧ q\right)\right)
Means \left(p ∨ q\right)happensbut(p∧q)happens but \left(p ∧ q\right) does not happen. It means only pp or only qq happens
Option \left(D\right)(p⇔q)\left(p ⇔ q\right) ≡ \left( p ∨ q\right)∨ \left( \left( p ∧ q\right)\right)<br/><br />≡ \left( \left( p ∨ q\right) ⇒ \left( p ∧ q\right)\right)<br />but not equivalent to \left(p ∨ q\right) ⇒ \left( p ∧ q\right)
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