Fran is doing an indirect proof with four given statements and one conclusion. How many of these statements must be false based on her assumption to contradict the assumption and prove the original conclusion?

Exactly three

All four

At least one

None of them

Question

Fran is doing an indirect proof with four given statements and one conclusion.  How many of these statements must be false based on her assumption to contradict the assumption and prove the original conclusion? 

 Exactly three 

 All four 

 At least one 

 None of them

anonymous · Answer

This is an odd question.

I would say at least one.

Usually it goes like this

Prove A
Assume B
B implies C etc etc leading to notB
Contradiction!

anonymous · Answer

ohh see i dont have a teacher and uv tought me more than i no already and u make sense so i feel comfortable asking cause u explain the answer and show me how to get it thank u

anonymous · Answer

Sure, no problem (I am not sure that I understand this question myself, it is worded a bit strangely)

anonymous · Answer

An example is to Prove that sqrt 2 is irrational.
You start off by saying assume it is rational  and then derive a contradiction which means that your assumption is wrong.

anonymous · Answer

ya i love algebra but i also had a teacher but geometry is harder cause i dont have a teacher if i could repay u i would

anonymous · Answer

if i post another can u help me its has to do with the same thing i think

anonymous · Answer

I have to go right  now but I will be back in a couple hours....

anonymous · Answer

okay  thank u