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Which of the following is a tautology ?...

Which of the following is a tautology ?

A

` p ^^ q`

B

` p vv q`

C

` p vv ~ p`

D

` p ^^ ~ p `

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The correct Answer is:
C
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OBJECTIVE RD SHARMA-MATHEMATICAL REASONING -Chapter Test
  1. Which of the following sentences is a statement ?

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  2. The property ~ ( p ^^ q) -= ~ p vv ~ q is called

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  3. When does the inverse of the statement ~ p Rightarrow q results in T...

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  4. which of the following is a contradiction ?

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  5. In which of the following is equivalent cases, p Rightarrow q is fal...

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  6. Which of the following is equivalent to p Rightarrow q ?

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  7. Which of the following pairs are logically equivalent ?

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  8. Which of the following is contingency ?

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  9. The statement p vv q is

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  10. Which of the following is a tautology ?

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  11. The statement p Rightarrow p vv q

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  12. what are the truth values of ( ~ p Rightarrow ~ q) and ~( ~ p Rightar...

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  13. If truth values of p vv q is true ,then truth value of ~ p ^^ q is

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  14. If p and q are two statements, then p vv ~ ( p Rightarrow ~ q) is ...

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  15. The contrapositive of statement ~ p Rightarrow ( p ^^ ~ q) is

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  16. ~ [ ~ p ^^ ( p harr q)] -=

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  17. If a compound statement r is contradiction , then the truth value of ...

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  18. When does the value of the statement (p ^^ r) harr ( r ^^ q) become...

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  19. If p always speaks against q, then p Rightarrow p vv ~ q is

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  20. Which of the following connectives satisfy commutatiive law ?

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