Modify the function in Example 8.1 so that it becomes f(x) = (x – 1)(x – 2)(x – 3)(x – 4)(x – 5)(x – 6)(x – 7) for 1 ≤  x ≤ 7. Plot a lot of points from 1 to 7 to see what the graph of this function looks like. Then use GRG Nonlinear Solver to find its maximum. Try the following starting points: 1, 3, 5, 6, and 6.9. Report what you find. Then try Evolutionary Solver. Does it find the correct solution?