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(1) If your house is hit by lightning while your computer is turned on, then your computer will be destroyed. (2) Your house was not hit by...

3. (1) If your house is hit by lightning while your computer is turned on, then

your computer will be destroyed.

(2) Your house was not hit by lightning.

(3) So, your computer was not destroyed.


a. valid and sound

b. valid and unsound

c. invalid and unsound


4. (1) All people who are computer literate make lots of money.

(2) Kelly is computer literate.

(3) So, Kelly makes lots of money.

a. valid and sound

b. valid and unsound

c. invalid and unsound

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