document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=881880>Question 881880</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A room has 3 lightbulbs. Each one has a 10% probability of burning out within the month. What is the probability that all 3 will be lit at the end of the month? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #532580 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=532580\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 10% probability of burning out within a month<BR>\n" );
document.write( "100-10 = 90% chance of not burning out within a month\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "90% = 0.9\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "(0.9)*(0.9)*(0.9) = (0.9)^3 = 0.729 = 72.9%\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "The probability that all 3 stay lit at the end of the month is <font color=\"red\">72.9%</font> </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );