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First and third drop down: An indirect proof or a direct proof.

First and third drop down: An indirect proof or a direct proof.-example-1
First and third drop down: An indirect proof or a direct proof.-example-1
First and third drop down: An indirect proof or a direct proof.-example-2
First and third drop down: An indirect proof or a direct proof.-example-3

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Looking at Julie's proof, she starts with the given information, and then the final statement is the "prove" wanted.

Therefore Julie used a direct proof because each statement is deduced from a previous statement.

Looking at Samuel's proof, he starts contradicting the "prove" wanted, and then the final statement contradicts the given information.

Therefore Samuel used an indirect proof because the final statement contradicts an assumption.

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