discrete math chap1

Which below is not a proposition?

• Kuala Lumpur is the capital of Malaysia

• 1 + 2

• Two plus two equals five

• 2+6 = 5

If the last digit of this number is 0, then this number can be divided by 10. The last digit of this number is 0. Therefore, this number can be divided by 10.

• modus ponens

• addition

• modus tollens

• hypothetical syllogism

What is tautology and contradiction?

• have two false , have two true

• have one false, have one true

• all true, all false

• can mix together

p : the sum of two numbers is 7 
q : the first number is 4

The sum of two numbers is 7 and the first number is 4

•  $p\vee q$  

•  $p\longrightarrow q$  

•  $p\longleftrightarrow q$  

•  $\rho\wedge q$  

What is this?

• OR , +

• AND , *

• NOT , !

When we get all false in the truth table, the answer is (a)  

Which rules of inference in figure A?

• modus ponens

• addition

• disjunctive syllogism

• modus tollens

Inference rule have ______ and ________

(a)  

which one is not the rule of inference?

• simplification

• elimination

• kruskal

• modus ponens

All below are logic connector, except?

• disjunction

• biconditional

• integer

• conditional