document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=702800>Question 702800</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Of 10 electric bulbs,three are defective but it not known which are defective. in how many ways can 3 bulbs be selected? how many of these selections will include at least one defective bulb?\r<BR>\n" );
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document.write( " please explain it in step by step when doing the calculation. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #433171 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=433171\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Of 10 electric bulbs,three are defective but it not known which are defective. in how many ways can 3 bulbs be selected? <BR>\n" );
document.write( "Ans: 10C3 = 120<BR>\n" );
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document.write( "how many of these selections will include at least one defective bulb?<BR>\n" );
document.write( "# that have NO defective is 7C3 = 35<BR>\n" );
document.write( "# with at least one defective is 120-35 = 85<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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document.write( "please explain it in step by step when doing the calculation.<BR>\n" );
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