Questions on Logic: Sets and operations answered by real tutors!

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Tutors Answer Your Questions about sets-and-operations (FREE)

Question 212262: using only 3 nines, create an equation that equals 12. you can use addition, subtraction, multiplying, dividing, and square roots
Click here to see answer by Alan3354(6092) About Me 
Question 212276: using only 3 nines, create an equation that equals 12. you can use addition, subtraction, multiplying, dividing, and square roots

Click here to see answer by jim_thompson5910(13794) About Me 
Question 213125: list the elements of the set of all letters in the word 'real'
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Question 221931: How do I solve this?
In a survey of 100 college students, 35 were registered in college algebra, 52 were registered in history 1, and 18 were registered in both courses. How many students were registered in college algebra or history 1. And how many were not registered in either course. thank you
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Question 224818: How many ways can three letters be chosen from the letters A,B,C,D, and E?
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Question 225955: Set D={Lower cost, Educational, Less time to see the sights, Can visit relatives along the way}
Set F= {Higher cost, Educational, More time to see the sights, Cannot visit relatives along the way}
Set U={Higher cost, Educational, More time to see the sights, Cannot visit relatives along the way, Lower cost, Less time to see the sights, Can visit relatives along the way}
Find the set of elements common to both sets:
F' and D'
The book has the answer being an empty set and I am not sure why. Can you explain why to me please?
Click here to see answer by jim_thompson5910(13794) About Me 
Older solutions: 1..45, 46..90, 91..135