What is the output of the following code? candidates = [(1,10), (2,9), (3,5), (4,8), (5,7), (6,6)] candidates.sort(key=lambda x: abs(x[0] - x[1]), reverse=True) print(candidates)

The key function computes the absolute difference between the two numbers in each tuple. The differences are: (1,10)->9, (2,9)->7, (3,5)->2, (4,8)->4, (5,7)->2, (6,6)->0. Sorting in descending order of these differences yields the sequence 9, 7, 4, 2, 2, 0. Python’s sort is stable, so tuples with equal keys keep their original order. Thus the final list is:

[(1, 10), (2, 9), (4, 8), (3, 5), (5, 7), (6, 6)].