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?

a. Exactly three

b. All four

c. At least one

d. None of them

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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?a. Exactly threeb. All fourc. At least oned. None of them

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?

a. Exactly three

b. All four

c. At least one

d. None of them