Question

D: Please help me, I'm so bloody confused!
Shelly, Jess, and Andrea are all working at an amusement park for the summer. The manager finds out that one of them left the key in the door to the security office. When he asked them who did it, they replied:
Shelly: Jess did it.
Jess: I didn’t do it.
Andrea: Jess did not do it.
The manager believed Jess. Use an indirect proof to show that Jess did not leave the key in the security office door.
Hint: Begin by assuming Jess did leave the key in the door.

Answer 1

here click on this link it might help u http://openstudy.com/study#/updates/4fdfd8a4e4b0f2662fd62bc2

Answer 2

I actually saw that, but its a different question, and I'm utterly confused as to what it is I'm supposed to do >.<

Answer 3

Is this a math question

Answer 4

Yeah, it was off of my Geometry study sheet on "Indirect Proofs"

Answer 5

Given:

Shelly: Andrea did it.
Jess: Shelly did not do it.
Andrea: I didn't do it.

Prove: Andrea did leave the key in the door.
For an indirect proof, assume that Andrea did leave the key in the door. Assuming she did. Shelly's statement that Andrea did it is TRUE. Assuming that Andrea left the key, Jess's statement that Shelly did not do it is TRUE. Finally, assuming that Andrea didn't leave the key, Andrea's statement that she didn't do it when she did is FALSE. Since two of the three given statements contradict the assumption, the assumption is false; therefore, its opposite is true. Andrea didn't leave the key in the door.

Answer 6

Okay, I slowly figured it out xD Thank you both so much :)