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Daily Drills 1 - Section 1 - Question 2

Select the answer choice that correctly diagrams the following Sufficient & Necessary statement: All Labrador ret...

jacaroe June 10, 2017

"All"

Is this saying that anytime we see "all" it automatically means a=b so not b= not a? So for this question, even though logically other dogs bark often since "all" is included we have to assume that if it doesn't bark often then it's not a lab?

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Mehran June 11, 2017

@jacaroe "all" introduces a sufficient condition, so "Labrador retrievers" is the sufficient condition.

The necessary condition is "bark a great deal."

The contrapositive would be:

not BGD ==> not L

Hope that helps! For a more in-depth review of these concepts, please watch our video lesson on Sufficient & Necessary Conditions.