retagged by
192 views
0 votes
0 votes

Consider the statements:

  1. $\text{A} \Leftrightarrow \text{A} \vee  \sim \text{A}$
  2. $\text{A} \Leftrightarrow \text{A} \vee    \text{A}$
  3. $\text{A} \vee \text{B} \Rightarrow \text{A}$
  4. $\text{A} \Rightarrow \text{A} \vee  \text{B}$

Which of the above refers to tautologies?

  1. $\text{III}$
  2. $\text{I}$ and $\text{II}$
  3. $\text{II}$ and $\text{IV}$
  4. $\text{I}$
retagged by

Please log in or register to answer this question.

Answer:

Related questions

0 votes
0 votes
0 answers
1
admin asked Jan 5, 2019
180 views
What is logically equivalent to the following statement? “I pass only if you pass” (Note that fail is equivalent to not pass.)If you pass then I passYou fail if I fai...
1 votes
1 votes
1 answer
3
admin asked Jan 5, 2019
380 views
The set of equations $x^{2} + y^{2} = 1$ and $x + y = 0$ has how many real solutions?Infinite number of solutionsNo solution$2$ solutions$1$ solution