exercise 1.3. Using the method we saw in class, show that 1 =1- 2+3 – 4+ 5 – 6+7–8..., 4 and 1 (2 ·1) – (3 · 2) + (4 · 3) – (5 · 4) + (6 - 5) – (7 - 6) · - - 4

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