document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1130938>Question 1130938</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Let X denote the number of girls in a family with four children. Calculate P(X &#8805; 3). \r<BR>\n" );
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document.write( "I honestly don't even know where to begin with this.\r<BR>\n" );
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document.write( "Can someone please explain how to solve such a question please?\r<BR>\n" );
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document.write( "Thank you! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #747578 by </B><A HREF=/tutors/aboutme.mpl?userid=math_helper><B>math_helper(2461)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=math_helper><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/cgi-bin/show-face.mpl?user=math_helper><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=747578\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let X denote the number of girls in a family with four children. Calculate P(X &#8805; 3). \r<BR>\n" );
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document.write( "I honestly don't even know where to begin with this.<BR>\n" );
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document.write( "They want the probability that the number of girls is 3 or 4 in a family of four children:<br>\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+P%28X%3E=3%29+=+P%28X=3%29+%2B+P%28X=4%29+ ALIGN=MIDDLE  ALT=\"+P%28X%3E=3%29+=+P%28X=3%29+%2B+P%28X=4%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br>\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+P%28X=3%29+=+%281%2F2%29%5E3%281%2F2%29%284C1%29+=+4%2F16+=+1%2F4+ ALIGN=MIDDLE  ALT=\"+P%28X=3%29+=+%281%2F2%29%5E3%281%2F2%29%284C1%29+=+4%2F16+=+1%2F4+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=P%28X=4%29+=+%281%2F2%29%5E4+=+1%2F16+ ALIGN=MIDDLE  ALT=\"P%28X=4%29+=+%281%2F2%29%5E4+=+1%2F16+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br>\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+P%28X%3E=3%29+=+4%2F16+%2B+1%2F16+=+highlight%28+5%2F16+%29+ ALIGN=MIDDLE  ALT=\"+P%28X%3E=3%29+=+4%2F16+%2B+1%2F16+=+highlight%28+5%2F16+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br>\r<BR>\n" );
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document.write( "To verify, we can enumerate all possible Boy/Girl families of four children:<br>\r<BR>\n" );
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document.write( "BBBB<BR>\n" );
document.write( "BBBG<BR>\n" );
document.write( "BBGB<BR>\n" );
document.write( "BBGG<BR>\n" );
document.write( "BGBB<BR>\n" );
document.write( "BGBG<BR>\n" );
document.write( "BGGB<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=green%28BGGG%29 ALIGN=MIDDLE  ALT=\"green%28BGGG%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "GBBB<BR>\n" );
document.write( "GBBG<BR>\n" );
document.write( "GBGB<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=green%28GBGG%29 ALIGN=MIDDLE  ALT=\"green%28GBGG%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "GGBB<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=green%28GGBG%29 ALIGN=MIDDLE  ALT=\"green%28GGBG%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=green%28GGGB%29 ALIGN=MIDDLE  ALT=\"green%28GGGB%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >   <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=red%28GGGG%29 ALIGN=MIDDLE  ALT=\"red%28GGGG%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "  </SPAN>\n" );
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