1 00:00:00,000 --> 00:00:03,000 And the answer would be this box over here 2 00:00:03,000 --> 00:00:06,000 and this box over here, nothing else. 3 00:00:06,000 --> 00:00:10,000 This guy has clearly 4 positive nearest neighbors, 4 00:00:10,000 --> 00:00:14,000 so no matter what the 5th one is we stay positive. 5 00:00:14,000 --> 00:00:16,000 Similarly, this guy over here, 6 00:00:16,000 --> 00:00:18,000 when you draw a circle, 7 00:00:18,000 --> 00:00:21,000 has probably these 4 guys as nearest neighbors, 8 00:00:21,000 --> 00:00:24,000 perhaps this one as well, but it is a little further away. 9 00:00:24,000 --> 00:00:27,000 With those 4 ones, it already has 3 pluses, 10 00:00:27,000 --> 00:00:30,000 so whatever the 5th one is it can't overturn, it must be positive. 11 00:00:30,000 --> 00:00:34,000 All of these are negative, even this one over here has just 2 pluses as neighbors 12 00:00:34,000 --> 00:00:37,000 that are positive, and those guys over here are all negative. 13 00:00:37,000 --> 00:00:41,000 Similarly, over here there are possibly 2 pluses 14 00:00:41,000 --> 00:00:43,000 in the 5 nearest neighbors, 15 00:00:43,000 --> 00:00:46,000 but these guys over here are all negative, and this guy is 16 00:00:46,000 --> 99:59:59,999 surrounded by negative examples, so they will just be negative.