document.write( "Question 470190: 63c7= c=63!/(63-7)!63!\r
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Algebra.Com's Answer #322531 by Tatiana_Stebko(1539) $\"\"$ $\"About$

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nCr=n!/((n-r)!r!)
\n" ); document.write( "63C7= 63!/((63-7)!7!)=63!/(56!7!)=(56!*57*58*59*60*61*62*63)/(56!*1*2*3*4*5*6*7)=(57*58*59*60*61*62*63)/(2*3*4*5*6*7)=553270671
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