GRE maths Q: How many selections of 4 books satisfy reqs?

Nerdyboy12345

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Hi guys, I'm having some trouble solving this question. Could anyone help me out please?



A reading list for a humanities course consists of 10 books, of which 4 are biographies and the rest are novels. Each student has to read four books, at least two of which must be biographies. How many selections of 4 books satisfy the requirements?

A. 90 . . .B. 115 . . .C. 130 . . .D. 144 . . .E. 195



Thanks a lot guys. (The answer is 115)
 

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Hi guys, I'm having some trouble solving this question. Could anyone help me out please?



A reading list for a humanities course consists of 10 books, of which 4 are biographies and the rest are novels. Each student has to read four books, at least two of which must be biographies. How many selections of 4 books satisfy the requirements?

A. 90 . . .B. 115 . . .C. 130 . . .D. 144 . . .E. 195



Thanks a lot guys. (The answer is 115)
Total choice = [2 B(iographies) & 2 N(ovels)] + [3B & 1 N] + [4 B] ... continue..
 
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