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The graph represents a salesman’s area of activity with the shops that the salesman must visit each day. What route around the shops has the minimum total distance?
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The graph below represents a salesman's area of activity with shops at A, B, C, D, E and F. (It isn't drawn to scale.)

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The numbers represent the distance in kilometres between the places that salesman must visit each day.

What route around the shops has the minimum total distance?