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A five-figure summary. The diagram forms three sides of a rectangle, with the bottom line missing. It therefore has a vertical line to the left, a horizontal line across the top and a vertical line to the right. To the left of the left vertical line is written n = 26. Towards the bottom of the line and to its right is written 170 and above that 230. Beneath the middle of the horizontal line is written 270. To the left of the second vertical line and level with 230 is written 327. Below that and level with 170 is written 699.

 Exercises on Section 3