range with negative step

Question

Accepted Answer

`range(10, 0, -3)` starts at 10 and counts down by 3, stopping before it reaches 0 (the stop value is exclusive). The sequence is 10, 7, 4, 1. Adding those gives 10 + 7 + 4 + 1 = 22. A common mistake is including 0 in the sum or forgetting that the stop is exclusive when counting downward, which would incorrectly give 22 + (-2) or 22 + 0.