Mixture of Gases: Composition & Properties

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MMCS
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Attached is the question and my working, my answers don't match up to the given answers, but they still seem right. Can anybody see where the mistake is?
 

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Your calculations look alright to me but an expert's view on the matter will be definitely welcome. Have you asked your professor?
 
Ok thanks. The answers provided are the ones given by the professor, ill assume he has made an error.