Sufficient & Necessary Questions - - Question 11

Nursing schools cannot attract a greater number of able applicants than they currently do unless the problems of low ...

Tiffanysara December 30, 2020

Unless statements

I thought that "unless" introduces a necessary condition and you have to negate the sufficient. In the first sentence, it says they cannot attract applicants as sufficient but didn't negate it.

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shunhe January 4, 2021

Hi @Tiffanysara,

Thanks for the question! That is how the unless statement works. But here’s the thing: in that statement, “cannot attract applicants” already contains a negation in it. So you have to negate the already-existing negation, and since that’s a double negative, they cancel out. That’s why the sufficient condition doesn’t have a “NOT,” because it would’ve been “NOT cannot,” and so that was just simplified to “attract applicants.”

Hope this helps! Feel free to ask any other questions that you might have.