document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=203977>Question 203977</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1.find all real values of 'w' for which the statement<BR>\n" );
document.write( "C(w+1,2)=9•C(w,1) is true.\r<BR>\n" );
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document.write( "2. while shooting arrows, William can hit an apple 9 out of 10 times. what is the probability that he will hit it exactly 4 out of the next 7 times. \r<BR>\n" );
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document.write( "*both of them were really hard for me to figure out. I appreciate your help.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #153914 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=153914\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1.find all real values of 'w' for which the statement<BR>\n" );
document.write( "C(w+1,2)=9•C(w,1) is true.\r<BR>\n" );
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document.write( "(w+1)!/[w-1)!2!] = 9w <BR>\n" );
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document.write( "Simplify:<BR>\n" );
document.write( "[(w+1)w]/2 = 9w<BR>\n" );
document.write( "w^2+w-18w = 0<BR>\n" );
document.write( "w^2-17w = 0<BR>\n" );
document.write( "w(w-17) = 0<BR>\n" );
document.write( "Positive solution:<BR>\n" );
document.write( "w = 17<BR>\n" );
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document.write( "2. while shooting arrows, William can hit an apple 9 out of 10 times. what is the probability that he will hit it exactly 4 out of the next 7 times. <BR>\n" );
document.write( "P(x=4) = 7C4(0.9)^4(0.1)^3 = 0.02296..<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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