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March 26th, 2014, 04:41 AM  #1 
Newbie Joined: Mar 2014 Posts: 2 Thanks: 0  Markov Chain is Null Recurrent
Hello If anyone is able to give me a hand or point me in the right direction I would be very grateful. I have a test on Friday and have absolutely no idea how to do this. Question: Two fair coins are tossed repeatedly. Let Xn denot (Total Number of Heads from Coin 1)(Total Number of Heads from Coin 2) after n tosses. Thus the state space is {0, ±1, ±2, .... }. Show that the zero state, where the total number of heads is the same for each coin, is null recurrent. Thank you so much in advance!! 

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chain, markov, null, recurrent 
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