judgement copy of case no.12376/1999

The answer is 17C6 = 17*16*15*14*13*12/(6*5*4*3*2*1) = 12376

All multiples of the lowest common multiple of 17 and 8 (which is 136) are divisible by 17 and 8, namely:

136, 272, 408, 544, 680, 816, 952, 1088, 1224, 1360, 1496, 1632, 1768, 1904, 2040, 2176, 2312, 2448, 2584, 2720, 2856, 2992, 3128, 3264, 3400, 3536, 3672, 3808, 3944, 4080, 4216, 4352, 4488, 4624, 4760, 4896, 5032, 5168, 5304, 5440, 5576, 5712, 5848, 5984, 6120, 6256, 6392, 6528, 6664, 6800, 6936, 7072, 7208, 7344, 7480, 7616, 7752, 7888, 8024, 8160, 8296, 8432, 8568, 8704, 8840, 8976, 9112, 9248, 9384, 9520, 9656, 9792, 9928, 10064, 10200, 10336, 10472, 10608, 10744, 10880, 11016, 11152, 11288, 11424, 11560, 11696, 11832, 11968, 12104, 12240, 12376, 12512, 12648, 12784, 12920, 13056, 13192, 13328, 13464, 13600, ...

A common denominator of 13 and 14 is a denominator into which 13 and 14 both divide. All multiples of their lowest common multiple (which is 182) can be used, namely any one of:

182, 364, 546, 728, 910, 1092, 1274, 1456, 1638, 1820, 2002, 2184, 2366, 2548, 2730, 2912, 3094, 3276, 3458, 3640, 3822, 4004, 4186, 4368, 4550, 4732, 4914, 5096, 5278, 5460, 5642, 5824, 6006, 6188, 6370, 6552, 6734, 6916, 7098, 7280, 7462, 7644, 7826, 8008, 8190, 8372, 8554, 8736, 8918, 9100, 9282, 9464, 9646, 9828, 10010, 10192, 10374, 10556, 10738, 10920, 11102, 11284, 11466, 11648, 11830, 12012, 12194, 12376, 12558, 12740, 12922, 13104, 13286, 13468, 13650, 13832, 14014, 14196, 14378, 14560, 14742, 14924, 15106, 15288, 15470, 15652, 15834, 16016, 16198, 16380, 16562, 16744, 16926, 17108, 17290, 17472, 17654, 17836, 18018, 18200, ...

13 goes into:
13, 26, 39, 52, 65, 78, 91, 104, 117, 130, 143, 156, 169, 182, 195, 208, 221, 234, 247, 260, 273, 286, 299, 312, 325, 338, 351, 364, 377, 390, 403, 416, 429, 442, 455, 468, 481, 494, 507, 520, 533, 546, 559, 572, 585, 598, 611, 624, 637, 650, 663, 676, 689, 702, 715, 728, 741, 754, 767, 780, 793, 806, 819, 832, 845, 858, 871, 884, 897, 910, 923, 936, 949, 962, 975, 988, 1001, 1014, 1027, 1040, 1053, 1066, 1079, 1092, 1105, 1118, 1131, 1144, 1157, 1170, 1183, 1196, 1209, 1222, 1235, 1248, 1261, 1274, 1287, 1300, ...

14 goes into:
14, 28, 42, 56, 70, 84, 98, 112, 126, 140, 154, 168, 182, 196, 210, 224, 238, 252, 266, 280, 294, 308, 322, 336, 350, 364, 378, 392, 406, 420, 434, 448, 462, 476, 490, 504, 518, 532, 546, 560, 574, 588, 602, 616, 630, 644, 658, 672, 686, 700, 714, 728, 742, 756, 770, 784, 798, 812, 826, 840, 854, 868, 882, 896, 910, 924, 938, 952, 966, 980, 994, 1008, 1022, 1036, 1050, 1064, 1078, 1092, 1106, 1120, 1134, 1148, 1162, 1176, 1190, 1204, 1218, 1232, 1246, 1260, 1274, 1288, 1302, 1316, 1330, 1344, 1358, 1372, 1386, 1400, ...

13 and 14 both go into:
182, 364, 546, 728, 910, 1092, 1274, 1456, 1638, 1820, 2002, 2184, 2366, 2548, 2730, 2912, 3094, 3276, 3458, 3640, 3822, 4004, 4186, 4368, 4550, 4732, 4914, 5096, 5278, 5460, 5642, 5824, 6006, 6188, 6370, 6552, 6734, 6916, 7098, 7280, 7462, 7644, 7826, 8008, 8190, 8372, 8554, 8736, 8918, 9100, 9282, 9464, 9646, 9828, 10010, 10192, 10374, 10556, 10738, 10920, 11102, 11284, 11466, 11648, 11830, 12012, 12194, 12376, 12558, 12740, 12922, 13104, 13286, 13468, 13650, 13832, 14014, 14196, 14378, 14560, 14742, 14924, 15106, 15288, 15470, 15652, 15834, 16016, 16198, 16380, 16562, 16744, 16926, 17108, 17290, 17472, 17654, 17836, 18018, 18200, ...