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

@ganeshie8

ganeshie8 · Answer

Atleast one contradiction is sufficient to conclude the statement you wanted to prove