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D1 June 2013 Mark Scheme incorrect

Hey guys,

To prepare for my mock exams when I come back in January I have decided to do some past papers. I came onto marking questions 3 and 5 and the answers don't seem to add up. For Q3 I am told to find a minimal spanning tree but the answer does not include all the arcs and rejects most of them even though they don't form cycles etc.

For Q5 the valency pairs are added up to be 10 less than my answers.

Am I reading the questions wrong or is the mark scheme incorrect.

Also with a quick sort, do the numbers have to be exactly in the same position as the mark scheme as I got my stationary and moving numbers around the wrong way.

Thanks.

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