This bet just seems stupid to me.
With so much confusion surrounding whether there will be a fake eviction or not, Irish bookmakers Paddy Power have decided to concentrate on when exactly Nadia will reveal she was a man?  
Although certain housemates had their suspicions right from the first day, Nadia has so far managed to avoid revealing her secret. This is not to say it has been easy, far from it.
During a few conversations, Nadia has had to tell a few lies in order to avoid speaking about her sex change. We have also seen the Portuguese born housemate struggle with what to do in the diary room a few times. 
The most likely time according to Paddy Power that Nadia reveals all will be in days 21-27. The odds on the housemates finding out about her sex change during this period are just 9/4.
If you believe the secret will come out during the next week, the price on offer is a more generous looking 8/1. The least likely time is during the first few days of August for which 25/1 is quoted. 
James Millman, readaBet.com
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http://www.readabet.com/index.php/other/article/4771