The odds depend on the number of unique digits in the combination, .... 0721, 0723, 0724, 0725, 0726, 0728, 0729, 0731, 0732, 0734, 0735, 0736, 0738, 0739, ... 0941, 0942, 0943, 0945, 0946, 0947, 0948, 0951, 0952, 0953, 0954, 0956, 0957, ... 1830, 1832, 1834, 1835, 1836, 1837, 1839, 1840, 1842, 1843, 1845, 1846, ...