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December 11th, 2015, 05:31 AM  #1 
Newbie Joined: Dec 2015 From: UK Posts: 1 Thanks: 0  Chance of stem cell match
Hi I'm trying to find the combined probability that a person will be a tissue mach to a single sibling. The probability that a sibling will be: a) an identical match to another sibling is 25% (1 in 4) b) a halfmatch to another sibling is 50% (1 in 2) There is some overlap because if a sibling is identical match they will also be, by definition, a halfmatch at the same time. Was told that the combined probability that a person will be a tissue mach to a single sibling is 75% (i.e. 25% chance of a halfmatch + 50% chance of identical match). Is this correct? Thanks in advance for helping me. Last edited by Nartholemue; December 11th, 2015 at 05:32 AM. Reason: additional information required 
December 11th, 2015, 09:42 AM  #2  
Newbie Joined: Dec 2015 From: Canada Posts: 15 Thanks: 1 
Hello, I think the answer to your question depends on your statement: Quote:
But if the intent is that the probability of a halfmatch and not an identical match is 50%, then the combined probability is 75%. Maybe you can tell from where you got the probabilities from. Or maybe someone else here can tell if there is an obvious intent in how the probabilities are stated.  

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