document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1120190>Question 1120190</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a boy has 3 library tickets and 8 books of his interest in the library. of these 8, he does not want to borrow chemistry part 2, unless chemistry part 1 is also borrowed. in how many ways can he choose the three books to be borrowed? </SPAN>\n" );
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document.write( "He can choose either<br><BR>\n" );
document.write( "(1) chemistry part 1 and any 2 of the other 7 books: C(1,1)*C(7,2) = 1*21 = 21<br><BR>\n" );
document.write( "or<br><BR>\n" );
document.write( "(2) not chemistry part 1, and therefore not chemistry part 2, and any 3 of the other 6 books: C(6,3) = 20<br><BR>\n" );
document.write( "The total number of ways he can choose 3 books is 21+20 = 41. </SPAN>\n" );
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