Q20 - Only experienced salespeople will

[ashleydymond]

Can someone please explain to me how the language in the stimulus translates into a correct logic diagram of the flawed reasoning? I believe I must have written it backwards somehow.

MQ---> Exp Sales

Flawed Contrapositive: -MQ ---> -Exp Sales

Thanks!

[maryadkins]

You're right! Did you see that (B) has the same flawed contrapositive--it negates both sides without flipping?

(A) introduces a new element (not going to work):
DC --> Fri
Conclusion: -DC --> not going to work

(C) EA --> O
Conclusion: -O --> --EA
Not flawed!

(D) GR --> NL
Conclusion: This tree must be a GR, b/c we're in NL
Also not flawed.

(E) SE --> AMC
Conclusion: AMC --> SE
Flawed contrapositive, but not the flaw we're looking for. Instead of negating without flipping, it flips without negating.

[ashleydymond]

Yes, I understand it now. I originally chose "E" because I was unsure about my logic translation, but now I can see how "B" mirrors the same flawed reasoning. Thanks!

[redskateboard]

How are B and E any different?

B:
1. TC -> ML
2. Not TC
Conclusion: Not ML

E:
1. SEC -> AMC logically equivalent to: Not AMC -> Not SEC
2. AMC
Conclusion: SEC

[AlisaS425]

How are B and E any different?

B:
1. TC -> ML
2. Not TC
Conclusion: Not ML

E:
1. SEC -> AMC logically equivalent to: Not AMC -> Not SEC
2. AMC
Conclusion: SEC

I had the same thought as you had, and here's what I thought about these two answer choices:

Argument
able to meet company's selling quota --> ONLY experienced sales
+
I will be able to sell only half the quota 
-->
I ~experienced sales

(B)
take this class --> ONLY music lovers
+
H not take this class
-->
H apparently not love music

(E)
can scale EC --> ONLY accomplished mountain climbers 
+
M is an accomplished mountain climbers
-->
M must be able to scale EC

The above highlighted part is what I thought to be the most important distinction between (B) and (E). (besides the illegal negation flaw) The highlighted part (e.g. experienced sales in the stimulus) should also be in the conclusion. However, the highlighted part in (E) (accomplished mountain climbers) appear in the stimulus, and thus is NOT parallel to the stimulus.

Any thoughts?