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 Administrator
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#32029
Please post below with any questions!
 ClaudiaK32
  • Posts: 14
  • Joined: May 01, 2017
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#34950
I chose B for this answer and am unsure for why C is correct.
 Charlie Melman
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#35147
Hi Claudia,

Answer choice (B) is incorrect because there is one setup where Q pushes the virus to two other computers. If Q is the piece that transmits to R and S, and T is the piece that transmits to Q (as the rules allow), then it's entirely possible to construct a situation that does not violate any of the rules.

But in answer choice (C), you can't satisfy the second-to-last and last rules at the same time, while also making R transmit to two other computers. You can satisfy one of the two, but not both.

I hope this makes sense!
 Ari
  • Posts: 22
  • Joined: Aug 27, 2020
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#79194
I am having a hard time with this. I also chose B. I tried to work out the problem as Charlie explained where T receives the virus, and transmits it Q, which transmits it to R and S. However, S has to transmit it to one computer and we are left with U and P. P has to receive the virus from T or U, so S must transmit the virus to U, but now where does P go? What am I missing here that would resolve my issue? Otherwise, I do not see how Q would not be correct. I do see why R is correct, but I just can't seem to create a diagram to make Q incorrect. Below is my replication of the diagram described above.

--- R --- P (wrong)
Virus --- T -- Q
--- S --- U
Charlie Melman wrote:Hi Claudia,

Answer choice (B) is incorrect because there is one setup where Q pushes the virus to two other computers. If Q is the piece that transmits to R and S, and T is the piece that transmits to Q (as the rules allow), then it's entirely possible to construct a situation that does not violate any of the rules.

But in answer choice (C), you can't satisfy the second-to-last and last rules at the same time, while also making R transmit to two other computers. You can satisfy one of the two, but not both.

I hope this makes sense!
 Ari
  • Posts: 22
  • Joined: Aug 27, 2020
|
#79196
Never mind! I was reading the 2nd rule to mean that S could only transmit it to one and that was the end, but you could have
S --- U --- P and R does not transmit it to any computer.
Ari wrote:I am having a hard time with this. I also chose B. I tried to work out the problem as Charlie explained where T receives the virus, and transmits it Q, which transmits it to R and S. However, S has to transmit it to one computer and we are left with U and P. P has to receive the virus from T or U, so S must transmit the virus to U, but now where does P go? What am I missing here that would resolve my issue? Otherwise, I do not see how Q would not be correct. I do see why R is correct, but I just can't seem to create a diagram to make Q incorrect. Below is my replication of the diagram described above.

--- R --- P (wrong)
Virus --- T -- Q
--- S --- U
Charlie Melman wrote:Hi Claudia,

Answer choice (B) is incorrect because there is one setup where Q pushes the virus to two other computers. If Q is the piece that transmits to R and S, and T is the piece that transmits to Q (as the rules allow), then it's entirely possible to construct a situation that does not violate any of the rules.

But in answer choice (C), you can't satisfy the second-to-last and last rules at the same time, while also making R transmit to two other computers. You can satisfy one of the two, but not both.

I hope this makes sense!

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