document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=197961>Question 197961</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If you asked three strangers about their birthdays, what is the probabilty..\r<BR>\n" );
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document.write( "a. All were born on Wednesday<BR>\n" );
document.write( "b. All were born on a different day of the week<BR>\n" );
document.write( "c. None were born on Saturday\r<BR>\n" );
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document.write( "Canm I get an explaination of how you got to the answer? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #148440 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=148440\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If you asked three strangers about their birthdays, what is the probabilty.. <BR>\n" );
document.write( "a. All were born on Wednesday<BR>\n" );
document.write( "P(any one of them was born on Wednesday) = 1/7<BR>\n" );
document.write( "P(all three were born on Wednesday) = (1/7)^3 = 1/343<BR>\n" );
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document.write( "b. All were born on a different day of the week<BR>\n" );
document.write( "P(all on different day) = 1 - [P(all on same day) + P(2 born on same day)]<BR>\n" );
document.write( "----<BR>\n" );
document.write( "P(all born on same day) = 7(1/343) = 1/7^2 = 1/49<BR>\n" );
document.write( "P(2 born on same day) = 7(1/7)^2(6/7) = 0.12245<BR>\n" );
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document.write( "Therefore P(all on different day = 1-[(1/49) + 0.12245] = 0.857...<BR>\n" );
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document.write( "c. None were born on Saturday <BR>\n" );
document.write( "P(none born on Saturday) = (6/7)^3 = 0.6297...<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
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