tag:blogger.com,1999:blog-15628310.post4492861909621801620..comments2021-03-02T05:02:26.838-05:00Comments on Question of the day: Urn is Such a Funny WordAnonymoushttp://www.blogger.com/profile/18153935609499338685noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-15628310.post-68292622560844369772010-02-18T10:41:41.307-05:002010-02-18T10:41:41.307-05:00400?400?Lisa Brownehttp://metacognaddiction.blogspot.comnoreply@blogger.comtag:blogger.com,1999:blog-15628310.post-33695026991168860732010-02-09T09:27:42.650-05:002010-02-09T09:27:42.650-05:00There were initially 190 balls in the urn; 10 each...There were initially 190 balls in the urn; 10 each of 19 different colors.Anonymoushttps://www.blogger.com/profile/18153935609499338685noreply@blogger.comtag:blogger.com,1999:blog-15628310.post-70685329760845633792010-02-08T12:20:36.745-05:002010-02-08T12:20:36.745-05:00n is the number of colors before the 20 balls are ...n is the number of colors before the 20 balls are introduced<br /><br />x is the number of balls in the urn before the 20 balls are introduced<br /><br />400/(x+20)^2+x^2/(n*(x+20)^2)=1/n<br /><br />Solve that to get<br /><br />x=10n-10<br /><br />So the answer is ten less than ten times the number of colorsUnknownhttps://www.blogger.com/profile/04828859222988784102noreply@blogger.com