document.write( "Question 42617: A bookshelf holds 4 mysteries, 3 biographies, 1 book of poetry, and 2 reference books. If a book is selected at random from the shelf, find the probability that the book selected is a biography or reference book.\r
\n" ); document.write( "\n" ); document.write( "Thank You
\n" ); document.write( "

Algebra.Com's Answer #27723 by Socom491(19)\"\" \"About 
You can put this solution on YOUR website!
Well, there are 10 total books. There are 3 biographies and 2 reference books. So the probability that either will be picked is 5/10 or 1/2. \n" ); document.write( "
\n" );