math

posted by .

Can someone explain this to me.

Determine if each conclusion is valid or invalid for the given statements.

a. Some expensive books are mystery books. All mystery books are interesting.

Conclusion: Some interesting books are expensive.

Valid or invalid.

b. Some teachers are smart.
Some nice people are smart.

Conclusion: Some teachers are nice people.

Valid or invalid

Draw two intersecting circles, label one "mystery books", the other " expensive books"
Now draw a circle, called "interesting", intersecting the expensive circle, but totally surrounding the mystery circle.

your conclusion was "Some interesting books are expensive"

Do you see an overlap in the 'interesting' and the 'expensive' circles??

Similar Questions

1. algebra

John has 36 books in his locker. He has text books,library books, and telephone books. How many books of each kind does he have if: lib + tel= 2x text books and text + tel = 3x lib books I think it'd be easier to let T,L and B denote …
2. math

lara arranged the books in her bookshelf by size. 2/10 of the books were tall and 1/2 of the books were medeium sized. If 12 of the books were small, how manyu total books did she arrange?
3. math

Hector owns science fiction novels, coming c books, and mystery novels. He has half as many science fiction novels as comic books and he has three times as many mystery novels as comic books. If he owns a totals of 54 books how many …

Rosalind Wiseman books Terra Elan McVoy books Susane Colasanti books Elizabeth Scott books Wendelin Van Draanen books Laura Preble books Piper Banks books Melissa Kantor books Kate Brian books Katie Finn books Pamela Wells books Cathy …
5. math

MEghan had 36 books in her locker. Some were library books, text books and the rest were telephone books. THe number of library books and phone books combined equals twice the number of text books. The number of text books and telephone …
6. math

The ratio of mystery books to the number of science fiction books is 4:3. The number of sci-fi books to the number of biographies is 4:5. If there are 48 sci-fi books what is the total number of books
7. MATHS

Mrs.Koh purchased new books for the school library, of which 6 were Mathematics books, 7 were Science books, 10 were Music books, 3 were Art books, and 4 were social studies books. All of these books were different. She picked a book …
8. math

1/8 of Tony's are mystery books he had3 mystery books. How many books does he have in all?