{"id":"ap-integer-division-exact","text":"In `missing-number-in-arithmetic-progression/solution.py`, the expression `(arr[-1] - arr[0]) // n` never truncates under valid inputs because the span of a valid AP is always an exact multiple of the gap count.","truth_value":"IN","source":"entries/2026/06/06/missing-number-in-arithmetic-progression-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"ap-integer-division-exact","truth_value":"IN","reason":"premise"}]}}