document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=352991>Question 352991</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a computer with an old processor locks up if more then 4 applications are running simultaneously.If the ower has 20 application stored in his program file,how many different sets of 4 can he run,so that his computer does not lock up? </SPAN>\n" );
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document.write( "For first set 4 applications can be selected from 20  by  20C4 ways\r<BR>\n" );
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document.write( "  For second set 4 applications can be selected from 16 by  16C4 ways\r<BR>\n" );
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document.write( "For third set 4 applications can be selected from 12 by  12C4 ways \r<BR>\n" );
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document.write( "For fourth set 4 applications can be selected from 8 by  8C4 ways\r<BR>\n" );
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document.write( "For fifth set 4 applications can be selected from 4 by  4C4 ways\r<BR>\n" );
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document.write( "Hence total no. of ways = 20C4 * 16C4 * 12C4 * 8C4 * 4C4\r<BR>\n" );
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document.write( "= 20! / (4^5) </SPAN>\n" );
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