#9 - An easy willingness to tell funny stories or jokes

[ericsilvagomez]

Hi,

From my understanding, answer choice A is the correct answer because it is the contrapositive of the first sentence, correct? If so, is it possible to solve this problem without diagramming? Can you explain more about how you combined both necessary conditions? I lost track when you were diagramming the different sentences.

[Dave Killoran]

Hi,

From my understanding, answer choice A is the correct answer because it is the contrapositive of the first sentence, correct? If so, is it possible to solve this problem without diagramming? Can you explain more about how you combined both necessary conditions? I lost track when you were diagramming the different sentences.

Hey Eric,

Thanks for the message! There's an extensive explanation to this problem on page 2 of this thread that maybe you missed? It's at viewtopic.php?f=702&t=3786, and confirms that A is a contrapositive and goes into detail on how to view this problem.

Thanks!

[askuwheteau@protonmail.com]

I got this question right...the only holdup being that my diagram for answer choice A is: MSC (Mark Self Confid)> WTS (Willing Tell Stories) OR OTS (Others Tell Stories). Dave's diagram has answer choice A's diagram with the "and" indicator between the necessary conditions, whereas I come out with an "or" between the necessary conditions. Does something in Answer Choice A's wording indicate the "and" between the necessary conditions?

Thx.

Jonathan

[Dana D]

Hey Jonathan,

The diagrams for this problem are as follows:
Since both diagrams above have the same necessary condition (SSC), they can be combined:

WTFS

Or → SSC

WHFS

In this diagram, you can either be willing to tell funny stories about yourself (WTFS) or hear funny stories about yourself (WHFS) and be self confident (SSC). Fulfilling either sufficient condition indicates the necessary condition is present. These are two separate rules that we combined into one, but they stand alone as well. In other words,

WTFS SSC

and separately,

WHFS SSC.

Now thinking of the contrapositive of either of these statements or of the combined diagram - if we /SSC, we then cannot be okay with either WTFS or WHFS - we have to negate both, because we are negating their sufficient condition (SSC).


WTFS

SSC → and

WHFS


or if you're thinking of these statements separately:

SSC →WTFS

SSC →WHFS

[askuwheteau@protonmail.com]

Hi Dana,

Thank you for providing clarification re the appropriate diagrams for this problem. I see now that I failed to change the OR to an AND when switching the orientation of the sufficient and necessary conditions.

A great week to you,

Jonathan