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

NTA Abhyas 2020 · Mathematics · Mathematical Reasoning

Let ⊕ and ⊗ are two mathematical operators. If p ⊕ (p ⊗ q) is not a...

Let ⊕⊕ and ⊗⊗ are two mathematical operators. If p⊕p ⊕\left(p ⊗ q\right)isnotatautology,thenis not a tautology, then⊕andand⊗ can be

Options

  1. A∨∨ and ⇒⇒ respectively
  2. B⇒⇒ and ∧∧ respectively
  3. C⇒⇒ and ∨∨ respectively
  4. DNone of these

Correct answer

B. ⇒⇒ and ∧∧ respectively

Step-by-step solution

\left(A\right)p ∨ \left(p ⇒ q\right) is false only if pisfalseand(p⇒q)isfalsewhichisneverpossiblesimultaneously.Hence,pis false and \left(p ⇒ q\right) is false which is never possible simultaneously. Hence,p ∨ \left(p ⇒ q\right)isatautology<br/>(C)p⇒(p∨q)isfalseonlyifis a tautology<br /> \left( C\right)p ⇒ \left(p ∨ q\right) is false only ifpis true and \left( p ∨ q\right) is false which is never possible simultaneously. Hence,p⇒(p∨q)p ⇒ \left(p ∨ q\right) is a tautology
\left(B\right)p ⇒ \left(p ∧ q\right) is false only if pp is true & p∧qp ∧ q is false which is possible when pp is true & qq is false. Hence, p⇒(p∧q)p ⇒ \left(p ∧ q\right) is not a tautology
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