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4. (a) Draw PK2 and PK2. Determine the eccentricities of all ver- tices in each of these graphs and identify the centre in both cases.
4. (a) Draw PK2 and PK2. Determine the eccentricities of all ver- tices in each of these graphs and identify the centre in both cases. (3) (b) How many vertices are in the centre of PK2 if n is even and if n is odd? Give a brief explanation. (3)
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