Online Course Discussion Forum

MC-II B Question 4.23

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MC-II B Question 4.23
by Eddy zheng - Saturday, December 22, 2018, 12:23 PM

For this question, I know how to do it, but why is it so weird? There aren't even any possible numbers that work when you do the intersection of 3 of the sets or all 4. Am I doing something wrong?

Picture of David Reynoso
Re: MC-II B Question 4.23
by David Reynoso - Thursday, January 10, 2019, 10:39 AM

Hey Eddy! This happens in a lot of problems. It is good practice to do problems like this so that we can realize that sometimes the intersection of some of the sets will be empty.