SOLUTION: Betty has 20 different books. Among the 20 books, 12 are classic novels, 6 are Science fictions, and 2 are reference books. If 7 classics novels, 2 Science fictions, and 1 refere

Question 1173853: Betty has 20 different books.
Among the 20 books, 12 are classic novels, 6 are Science fictions, and 2 are reference books. If 7
classics novels, 2 Science fictions, and 1 reference book are selected, how many combinations are
there?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi,

12novels, 6 SciFi, 2 ref  ( 20 Books)

7 classics novels, 2 Science fictions, and 1 reference book are selected, 

 how many combinations are there?

   (12C7)(6C2)(2C1) = (792)(15)(2)= 23,760

Wish You the Best in your Studies.

 

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