Q50 / 90 · JEE Main 2022 (29 Jul Shift 2) · Mathematics

The statement p⇒q∨p⇒r is NOT equivalent to:

  • A
    p∧~r⇒q
  • Correct answer
    B
    ~q⇒~r∨p
  • C
    p⇒q∨r
  • D
    p∧~q⇒r

Solution

Given,

p⇒q∨p⇒r

Now using the formula A⇒B≡~A∨B

We get, ~p∨q∨~p∨r

≡~p∨q∨r

≡p⇒q∨r, so option C is true.

Now solving option 1 we get,

 p∧~r⇒q

≡~p∧~r∨q

≡~p∨r∨q

≡~p∨r∨q

≡~p∨r∨~p∨q

≡p⇒q∨p⇒r, so option 1 is also true,

Now solving option 4 we get, 

p∧~q⇒r

≡~p∧~q∨r

≡~p∨q∨r

≡~p∨q∨r

≡~p∨q∨~p∨r

≡p⇒q∨p⇒r, so option 4 is also correct.

Hence option B is only wrong.

Hence, the correct answer is option: 'B'.

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