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JEE Main202127 Aug 2021Evening ShiftMathematicsMathematical ReasoningActual

The Boolean expression ( p ∧ q ) ⇒ r ∧ q ∧ p is equivalent to:

Options

  1. A( p ∧ r ) ⇒ ( p ∧ q )
  2. B( q ∧ r ) ⇒ ( p ∧ q )
  3. C( p ∧ q ) ⇒ ( r ∧ q )
  4. D( p ∧ q ) ⇒ ( r ∨ q )

Correct answer

C. ( p ∧ q ) ⇒ ( r ∧ q )

Step-by-step solution

( p ∧ q ) ⇒ ( ( r ∧ q ) ∧ p ) ≡ ( p ∧ q ) ⇒ ( r ∧ ( p ∧ q ) ) … … . ( i ) Case: I when p ∧ q = T and r = F Statement - ( i ) is false as well as option ( 3 ) is also false option ( 1 ) , option ( 2 ) are True so given expression is not equivalent to option ( 1 ) , option ( 2 ) option ( 4 ) may be true if we consider q = T ∴ option ( 4 ) is also not equivalent to option ( 1 ) Case : I I p ∧ q = False

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