document.write( "Question 463999: You have 7 old books and need to choose 4 to give away. How many different groups of 4 books can you make? \n" ); document.write( "
Algebra.Com's Answer #317816 by edjones(8007)\"\" \"About 
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nCr=Combination of n things taken r at a time=n!/((n-r)!*r!)
\n" ); document.write( "7C4=35
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