Question

http://prntscr.com/9kd1xf would someone please explain this to me?

Answer 1

What part are you having trouble with

Answer 2

http://snag.gy/Kp5Zn.jpg

Answer 3

i just don't understand the question. like i know the whole law thing, but i need an explanation on how to work them out

Answer 4

thank you! this will definately help!

Answer 5

so look at the conclusion last

Answer 6

29:
r->p
p->q

This is Transitivity (its like a chain)

Answer 7

sooo r -> q

Answer 8

yea like in the table

Answer 9

okay

Answer 10

I dont think 30 is valid. p->r and p->~r sounds like a contradiction

Answer 11

hang on a minute

Answer 12

Yea

Answer 13

http://prntscr.com/9kd6vv here

Answer 14

29. Transitivity 30. Invalid

Answer 15

Can you figure out 31?

Answer 16

contradiction?

Answer 17

Look at the two on the table that start with modus

Answer 18

my only choices are syllogism, contrapositive, and detachment....i think it might be contrapositive :T

Answer 19

Yea you get modus tollens from the contrapositive

Answer 20

oh okay :)

Answer 21

p->q becomes
~q -> ~p

so you have

~q -> ~p
~q
therefore ~p

Answer 22

okay