document.write( "Question 869925: I have 7 CDs I want to select 4 to play in my car CD player. In how many ways can I select 4 of 7 CDs? \n" ); document.write( "
Algebra.Com's Answer #524557 by Alan3354(69443)\"\" \"About 
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7*6*5*4 = 840
\n" ); document.write( "But, selecting A, B, C & D is the same as D,B,A & C
\n" ); document.write( "4*3*2*1 = 24
\n" ); document.write( "--> 840/24 = 35 ways
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