Question

Indirect proofing

Answer 1

Angie did the following proof in her logic class. Which step in the indirect proof did she do incorrectly?

Prove: 8 is divisible by 4.

Step 1: Assume that 8 is not divisible by four.
Step 2: 8 is divisible by 4
Step 3: 8 is divisible by 4.

Answer 2

Step 1

Steps 1 and 3

Step 3

Step 2

Answer 3

do u know the steps?

Answer 4

which one do u think it is?

Answer 5

Step 1? I'm terrible at proofing, for some reason I just can't seem to understand it....

Answer 6

ok let me explain its quite easy

Answer 7

Ok

Answer 8

step ne is to assume the opposite of what ur trying to prove

Answer 9

so what would be step one? is it correct?

Answer 10

the first step is true

Answer 11

what ever u are trying to prove u say the opposite

Answer 12

good

Answer 13

now step two

Answer 14

then arrive at a contradiction

Answer 15

Ok

Answer 16

do u want me to specify more?

Answer 17

yes please

Answer 18

for step two u have to prove that ur statement is the opposite of statement one

Answer 19

u have to prove it by using ur knowledge

Answer 20

then for statement three u would say what u needed to prove

Answer 21

do u understand

Answer 22

for step 2 u need to prove that the first statement is wrong

Answer 23

so now do u know whats the answer?

Answer 24

u there?

Answer 25

anyway the answer is step two