1) Which of the following are (valid) statements?

a) Will this class be fun?

b) Next year the stock market will go up.

c) Three is a prime number.

d) 5 is an even number.

e) She is shorter than 60 inches.

2) Consider the following implication: "If it is snowing on Friday, then I will go for a walk on Friday." If it is not snowing on Friday and I go for a walk, is the statement still true?

3) For the following implication: "If it is snowing on Friday, then I will go for a walk on Friday."

a) What is the antecedent?

b) What is the consequent?

c) Reword the statement in the form "A is a sufficient condition for B."

d) Reword the statement in the form "B is a necessary condition for A."

4) Use a truth table to show that A B is equivalent to A (B').

A B A B B' A (B')
T T      
T F      
F T      
F F