These are the"Nothing Numbers" below ....there are 66 of them.. 

037, 127, 136, 145, 235, 389, 479, 038, 047, 056, 146, 236, 245, 489, 039, 057, 138, 147, 156, 237, 049, 058, 067, 148, 238, 247, 256, 059, 149, 158, 167, 239, 257, 069, 078, 168, 249, 258, 267, 348, 015, 079, 169, 178, 259, 349, 358, 016, 025, 269, 278, 368, 458, 017, 035, 125, 279, 369, 378, 459, 027, 036, 045, 126, 469, 478

        They hit 39.6 or 40% of the time. Almost 50% of the time a Single hits. Every other time.  

 They have one thing in common... They are Mixed Numbers     (( They are NOT ...1. ALL HIGH or ALL LOW .....not  2. ALL EVEN ..or ODD  ......not .....3. All IN or ALL out .   

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                             These numbers are "ALL That" numbers ... 56 of them

                              they are the ALL    HIGH,LOW,  IN,OUT,     EVENs and ALL ODDS.

                They should hit about 34% of the time ......or almost every other time a single hits.  

019, 028, 046, 569, 578, 029, 128, 137, 579, 678, 048, 129, 246, 345, 589, 679, 012, 139, 157, 346, 689, 013, 068, 248, 347, 356, 789, 014, 023, 159, 357, 456, 024, 123, 268, 367, 457, 034, 089, 124, 179, 359, 467, 026, 134, 189, 468, 567, 018, 135, 234, 289, 379, 568

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     So...there is a slight Bias .... 66 to 54 numbers.....or  40% to 34% ....but close enough for Gov work.  When Singles hit .....its either one ...or ...the other.