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January 26th, 2010, 12:04 PM  #1 
Newbie Joined: Jan 2010 Posts: 9 Thanks: 0  Cards problem
Hi all, I am student and I have to solve a problem about cards. The problem is : "a. Find the probability the twentyfourth card to be 1. b. Find the probability to choose the first 1 after seven choices". And another , I know that when I have a pdf I equals with 1 so as to find a constant. But how can I find the integration of function (1/a)^x from inf to inf. I made a matlab code and I took the answer piecewise([0 < a and a <> 1, Inf], [Otherwise, int((1/a)^x, x = Inf..Inf)]) but I don't understand what it means. Could anyone help me ?? Thanks in advance 
January 27th, 2010, 12:51 AM  #2 
Newbie Joined: Jan 2010 Posts: 9 Thanks: 0  Re: Cards problem
Anybody ?? please 
January 27th, 2010, 04:02 AM  #3  
Senior Member Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3  Re: Cards problem Quote:
Quote:
(48/52)*(47/51)*(46/50)*(45/49)*(44/4*(43/47)*(42/46)*(4/45) = (44*43*42*4) / (52*51*50*49)  
January 27th, 2010, 04:25 AM  #4 
Newbie Joined: Jan 2010 Posts: 9 Thanks: 0  Re: Cards problem
Yes exactly. I am sorry but my engish is not good enough. Thanks a lot!!! 

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