To be considered for this year's Gillespie Grant, applications must be received in Gillespie City by October. It can ...
on June 3, 2019
Explanation
I'm unsure as to why the correct answer in this case is actually the correct answer. In the video lessons I learned that "only if" is equivalent to "if and only if." So, when saying that her application would be reviewed "only if" it was mailed 10 days before excludes all other considerations for it being reviewed. Any help would be appreciated, thanks!
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In the video lessons, "only if" and "if and only if" are not described as equivalent statements.
"Only if" introduces the necessary condition, whereas "if and only if is a bi-conditional statement."
I will go to Mars only if I have a rocket
Mars - >rocket
I will go to the movie if and only if David comes with me
Movie< - >David comes
For the question you're asking about, diagramming helps a lot.
Considered for Grant - >Application Received by Oct. 1
Sometimes it takes mail 10 days to get from Greendale to Gillespie
Conclusion: Send application by regular mail - >must mail 10 days before the due date
The conclusion is incorrect in saying that the mail has to be sent 10 days before the due date. All that we know is that it may take up to 10 days for the mail to get from Greendale to Gillespie, but that doesn't mean that the mail always takes 10 days. It's possible some mail arrives well before 10 days.
(C) says, "does not consider the minimum amount of time it takes regular mail from Greendale to reach Gillespie City"
(C) is precisely what we had anticipated in our analysis. The argument is not thinking about the possibility that it may sometimes take fewer than 10 days for mail to go from Greendale to Gillespie. In those instances, it wouldn't be necessary to mail in an application 10 days before it's due. Thus, (C) is the correct answer.
Hope this helps. Let us know if you have any more questions!